102. PORPHYRY (probably diorite), Placer County. Said to be found in large quantities. A very beautiful building and ornamental stone, equal to the finest porphyries of Egypt and Europe.

103. PORPHYRY, seventy-five feet thick, Bodie Mine, Mono County. 104. PUMICE STONE, near Mammoth City, Mono County. 105. PUMICE STONE, near Dos Palmos, San Diego County.

106. ROCK RESEMBLING HALLEFLINTA, Fruit Vale, Alameda County.

107. ROCK RESEMBLING HALLEFLINTA, Spanish Ranch, Plumas County.

108. SAND ROCK, with chalcedony, ten miles west of Havilah, Kern County.

109. SANDSTONE, near San José, Santa Clara County.

110. SANDSTONE, eighteen feet thick, Tuolumne County.

111. SANDSTONE, Saucelito, Marin County.

112. SANDSTONE, Glenn Mills, San Mateo County.

113. SANDSTONE, eight miles west of Napa City, Napa County.

114. SANDSTONE, suitable for building stone, Eureka, Humboldt County.

115. SANDSTONE (stained red), Santa Margarita Ranch, San Diego County, near San Luis Rey.

116. SANDSTONE, Glenn Mills, San Mateo County.

117. SANDSTONE, west side of Great Eastern Quicksilver Mine, Sonoma County, supposed to be the footwall.

118. SANDSTONE (coarse grained), Coal Mine, San Benito County, township nineteen south, range eleven east.

119. SANDSTONE (fine grained), Coal Mine, San Benito County, township nineteen south, range eleven east.

120. SANDSTONE, Seal Rock, off Point St. George, northwest boundary of California.

121. SANDSTONE, fossiliferous, near Shasta.

122. SANDSTONE, variegated, near Buchanan Copper Mine, Fresno County.

123. SANDSTONE, feldspathic, sedimentary rock, composed of feldspar, quartz mica, and hornblende, Telegraph Hill, San Francisco. 124. SANDSTONE, Pescadero, San Mateo County.

125. SCORIA, Point San Pedro, San Mateo County, eighteen miles south of San Francisco.

126. SCHIST with garnets, mouth of Russian River, Sonoma County. 127. SCHIST, with impressions of fossil plants, found in the lignite near Vacaville, Solano County.

128. SEDIMENTARY DEPOSIT, Chalk Bluffs, near surface, containing impressions of fossil leaves.

129. SEDIMENTARY MATTER, North Bloomfield Mine, Nevada County.

130. SEDIMENTARY DEPOSIT, found in digging a well, at a depth of seventy-five feet, near Roseville Station, Placer County.

131. SEDIMENTARY ROCK, San Francisco.

132. SEDIMENTARY ROCK, Cliff House, San Francisco.

133. SEDIMENTARY ROCK, Oil Creek, San Luis Obispo County, found in slabs from two to eight inches thick, and from one to three feet wide.

134. SEDIMENTARY DEPOSIT, resembling diatomaceous earth, twelve miles east of Santa Rosa, Sonoma County.

135. SERPENTINE, Bear Valley, Mariposa County.

136. SERPENTINE, Key's Tunnel, California Mine, Yolo County. 137. SERPENTINE, three hundred yards northeast of Pine Tree Mine, Bear Valley, Mariposa County.

138. SERPENTINE, transformation from gabbro, Peninsula of San Francisco.

139. SERPENTINE, Fort Point, San Francisco.

140. SERPENTINE, Yuba County.

141. SERPENTINE, Market and Guerrero Streets, San Francisco. 142. SERPENTINE, center of Lone Mountain Cemetery, San Francisco. 143. SERPENTINE (five varieties), Lone Mountain Cemetery, San Francisco.

144. SERPENTINE, Market Street Cut, San Francisco.

145. SERPENTINE SCHISTOSE, met with before reaching the so called footwall, New Almaden Quicksilver Mine, Santa Clara County. 146. SERPENTINE, Kelseyville, Lake County. 147. SERPENTINE, Bald Prairie, Placer County. 148. SERPENTINE, Monterey, Monterey County.

149. SHALE (with Lignite), near San Bernardino, San Bernardino County.

150. SHELL ROCK, Sandstone Bluff, township one north, and on the Humboldt meridian, Humboldt County.

151. SILICIOUS BRECCIA, Little Butte, section thirteen, township thirteen south, range thirty-five east, Mount Diablo meridian.

152. SLATE AND GRANITE, Bodie District, Mono County.

153. SLATE AND PYRITES, Mariposa Tunnel, two thousand six hundred and twenty foot point, Mariposa County.

154. SLATE, which crops out over a large extent of country between San Andreas and Cave City, Calaveras County; strike nearly west northwest, dip nearly vertical.

155. SLATE, near Red Hill, Butte County.

156. SLATE, near Emigrant Gap, Placer County.

157. SLATE, roofing, El Dorado County.

158. STRATIFIED FORMATION, old lime kiln, near Clipper Gap, Placer County.

159. SYENITE, Point San Pedro, San Mateo County, eighteen miles south of San Francisco.

160. TALCOSE ROCK, wall rock of the Idaho Mine, Grass Valley, Nevada County.

161. TALCOSE SLATE, Tuolumne County.

162. TALCOSE SLATE, El Dorado County.

163. TRACHYTE, near St. Helena, Napa County.

164. TRIPOLITE, Santa Barbara.

165. TUFA, Kern County.

166. TUFA, Sulphur Springs, Mono County.

167. TUFA, very interesting formation, Gold Gravel Hydraulic Mine, La Porte, Plumas County.

168. VOLCANIC BRECCIA, used as a building stone in Susanville. It is said to resist the action of fire, as shown during a recent conflagration in that town. Section five, township twenty-nine north, range thirteen east, eight and one half miles from Susanville, Lassen County.

169. VOLCANIC CONGLOMERATE, Mono Lake, Mono County. 170. VOLCANIC ROCK, Kelsey Valley, Lake County, taken from a well ten feet deep. It is several feet in thickness. Sinking the well was discontinued, owing to the emanation of large quantities of carbonic acid

gas.

171. VOLCANIC ASH (allied to pumice stone), Calaveras County, eighteen miles from Lodi.

172. VOLCANIC TUFA (so called white lava). A similar rock is used in Europe in building ovens for bread baking. Found near Etna Springs, Napa County.

173. VOLCANIC ASH, Chalk Bluffs, Nevada County.

174. VOLCANIC ASH, Ione Valley, Amador County.

175. VOLCANIC ASH, Tufa or Lava, Mono County, near Carson and Colorado Railroad.

The following have been added since the publication of the second volume of the museum catalogue:

176. ANTHRACONITE, cave at Murphy's, Calaveras County.

177. BITUMINOUS SHALE, from which oil and gas can be manufactured, Calistoga, Napa County.

178. BRECCIATED QUARTZ, vein matter, Calistoga or Venus Mine, Mt. St. Helena, Napa County.

179. BROWN COAL (Lignite), from vein near Lancha Plana, Calaveras County.

180. BUILDING STONE, Valley Springs, Calaveras County.

181. CAPROCK, used for paving sluices, worn from thickness of eighteen. inches by eight months' use, Spring Valley Mine, Cherokee, Butte County. 182. CONCRETION, resembling a geode, Bottle Hill, El Dorado County.

183. DUNNITE, from Carga Muchacho gold mining district, San Diego County. This rock is more minutely described elsewhere.

184. FELDSPAR (orthoclase), Hunsecker Grade, stage road from San Diego to Julian, San Diego County.

185. FREESTONE, from Stony Brook, near Niles, Alameda County, on the property of J. D. Farwell. It seems to possess many of the qualities which characterize a good building stone. In the quarry where the croppings have long been exposed to the elements, it shows evidences of great durability, as it does laid in the piers and abutments of the railroad bridge which crosses the Alameda Creek near by. This block has been sculptured by Morton A. Edwards, of San Francisco, and was presented by J. D. Farwell.

186. LAVA, used in building at Mokelumne Hill, Calaveras County. Three varieties. It is a durable and convenient material, and could be more generally utilized.

187. PEGMATITE, Hunsecker Grade, stage road from San Diego to Julian, San Diego County.

188. ROCK SPECIMEN, from the summit of Mt. St. Helena, altitude 4,343 feet. It rises in columns like basalt, in large outcrops; the whole summit of the mountain is of this formation. The soil produced by its disintegration is of a pale green color. Napa County.

189. ROCK SPECIMEN, from the side of Mt. St. Helena, Napa County. 190. ROCK RESEMBLING HALLEFLINTA, found on the sides of Mt. St. Helena, Napa County.

191. ROCK SPECIMEN, with veins of cinnabar, Manhattan Mine, Napa County.

192. ROCK SPECIMEN, near Deffebach's Ranch, one mile from the bay, Sausalito, Marin County.

193. ROCK SPECIMEN, from first tunnel on N. P. C. R. R., Blithdale Station, Marin County.

194. ROCK SPECIMEN, with microscopical section, Union Mine, near San Andreas, Calaveras County, believed to be slaty serpentine.

195. ROCK CONTAINING FOSSIL TURRITELLA. Section thirtythree, township twenty-two south, range sixteen east, Mt. Diablo meridian. Fossils are very abundant at this locality.

196. SAND, from the beach, near the whaling station, Monterey, Monterey County.

197. SAND, from opposite the bath house, Santa Barbara.

198. SAND, from the ocean beach, two miles south of Pescadero, San Mateo County.

199. SERPENTINE, Point Tiburon, Marin County.

200. SERPENTINE FOLIATED, altered to Picrolite, found in considerable quantity in Mendocino County, township nineteen north, range ten west, Mt. Diablo meridian.

201. SILICIOUS MINERAL, OR ROCK, probably a deposition from hot mineral water. This specimen is opaque, and shows the effect of solfataric action about the orifices, round the mouths of which little ridges of silica have been deposited. Manhattan Quicksilver Mine, Napa County. 202. STEATITE, Coulterville, Mariposa County. Of excellent quality, and said to be in large quantities.

203. WALL ROCK, Manhattan Mine, Napa County.

204. WALL ROCK WITH FOSSILS, Manzanita Gold Mine, Sulphur Creek, Colusa County.

An excellent building stone is found in a white rock, of sedimentary origin, thought to be volcanic ash. It is found in the foothills over a large extent of country. It has been used in building in Mokelumne Hill, Calaveras County, for many years, where it has been found to be very durable. The walls of some buildings which were destroyed by fire are uninjured, or only slightly so. There are some fine buildings being constructed of this stone in St. Helena, in Napa County. Their general appearance is very fine. This material should be introduced into San Francisco and other large towns.

Basaltic rocks are quite common in numerous localities in the State. In Butte County, between Oroville and Magalia, there are large outcrops of cellular lava and fine columnar bluffs. The stone is of excellent quality, and quite suitable for pavements and building. The basaltic columns of Mount St. Helena have been described elsewhere.

EXAMINATION OF DUNNITE FROM SAN DIEGO COUNTY-NO. 183 OF THE

ABOVE LIST.

Color pale green, with dark spots. It consists of three distinct minerals-olivine, magnetite, and a micaceous mineral, unknown.

In its natural state it slightly deflects the needle. When pulverized, a portion can be removed by the magnet, and on heating to redness, a second smaller portion becomes magnetic, and can be separated in the same way. A sample of rock was pulverized, sized by sifting, and placed in a long glass tube full of water. On placing the tube in a vertical position, the magnetite fell first. The other two minerals did not separate, but fell together, showing that they had nearly the same specific gravity. Another portion was divided into three parts by the magnet as follows:

The non-magnetic portion (C) was examined under the microscope and found to consist of two minerals, one dark colored, but which changed to bronze color by heating. The other was pale green in nearly transparent angular particles, with vitreous luster. Being of the same sized particles, of nearly the same specific gravity, they were counted under the microscope and found to be in equal numbers very nearly, therefore the mechanical analysis would stand thus:

The portion (C) from which magnetite had been removed by the magnet was boiled repeatedly in nitro-hydrochloric acid, by which treatment the micaceous mineral was decomposed. The residue being well washed, the pale green mineral (olivine) was left in a state of apparent purity. The specific gravity was found to be 3.321.

This is a beautiful and interesting rock, and one that it would seem might be put to some practical use. Sections cut for the microscope are also very interesting.

The following is the result of an examination of the straw-colored sandstone from Santa Barbara, used in the construction of the old Mission, and latterly in a number of fine modern buildings in the beautiful town of Santa Barbara: Specific gravity, 2.7; one part of the stone by weight absorbed only .012 parts of water. The stone is rather easily reduced to powder; more so when wet. In this respect it resembles the sandstone of a similar color found at San José. Under the microscope the powder is seen to consist of rounded grains of milky quartz. The silica was determined and found to be 75 per cent. The specific gravity being as above, a cubic foot would weigh 168.75 pounds. While this is a beautiful and easily worked building stone, its use in the old Mission has shown that it is not very durable.

TABLE OF ALTITUDES.

The first 1,109 are copied from Bulletin of the United States Geological Survey No. 5; the remainder are gathered from various sources, and may be considered as approximative. They are probably as correct as those generally first published in a new and large State like California.