fore, cooled and weighed. The loss in weight gives the soluble silica in 10 grams of soil. Nitrogen: 10 grams of the soil are treated by the modified Kjeldahl method, as described under nitrogen in plants, or 10 grams are burned with soda lime. Analysis of some grasses and weeds, with regard to their nutritive constituents, samples collected and prepared for analyses by the Station Botanist: 100 parts of air- 100 parts of dry matter contain Name. Oat Grass, Danthonia spicata Wild Oat Grass, Arrhenathorum avenaceum. Clot Burr. Xanthium Stramarium... Iron Weed, Vernonia novaboracense. Old White Top or Velvet Grass, Holcus lanatus. Quill-Weed or Queen of the Meadow, Eupatorium purpureum. 8.55 91.45 7.00 29.45 9.02 8.83 45.70 Golden-rod, Solidago juncea Horse-Weed or Butter Weed. Lactuca Canadensis Wild Lettuce, Lactuca leucophaea. 43 Rag Weed, Ambrosia artemisiaefolia. Broom-sedge, Andropagon seopurius The methods of analysis employed were those adopted by the Association of Official Agricultural Chemists for 1891-92. 100 parts of airdried substance contain 100 parts of the dry matter contain Analysis of some grasses and weeds with regard to their fertilizing constituents. Sample collected and prepared for analysis by the Station Botanist. 35 Iron-Weed, Vernonia Novaboracensis 7.73 92.27 7.49 2.07 36 Quill-Weed or Queen of the Meadow, Eupatorium purpureum. 8.55 91.45 9.02 1.41 37 Golden-rod, Solidago juncea. 8.00 92.00 5.48 1.27 38 Horse-Weed or Butter-Weed, Lactuca Canadensis 7.49 92.51 5.77 1.07 39 Wild Lettuce, Lactuca leucophaea. 10.40 89.60 8.37 2.06 40 Wild Coreopsis, Coreopsis tripteris 8.56 91.14 7.73 1.56 41 Crow's-foot Grass, Panicum sanguinale. 6.79 93.21 10.89 1.89 42 Fox's-tail Grass, Setaria glauca. 7.07 92.93 10.01 1.77 43 Rag-Weed, Ambrosia artemisia folia. 7.77 92.23 6.12 1.36 Broom Sedge, Andropogon scoparius. Blue Thistle, Echium vulgare. Lab. No. Name. Analysis of some grasses and weeds with regard to their fertilizing constituents. etc.-Continued. 100 parts of airdried substance contain 100 parts of the dry matter contain Moisture at 100 deg. C. Dry matter. Ash. Nitrogen. Phosphoric Acid. Potash. The results of these analyses have been utilized by the Station Botanist in Bulletins treating of the Weeds and Grasses of the State. The method of analysis for the fertilizing ingredients is as follows. METHODS OF DETERMINING FERTILIZING INGREDIENTS OF Preparation of Sample: PLANTS. The plants is freed as far as possible from all foreign matter and weighed. It is then placed on a large clean piece of paper in a warm place free from dust until sufficiently dry. It is again weighed and then ground as fine as possible in a mill, sifted and the coarser particles again ground till all passes the sieve. The sample is then mixed and a small portion preserved for analysis, in a glass-stoppered bottle. Moisture: 2 grams are placed in a tube, weighed and dried in a current of dry air at 100° C. till weight is constant. The loss in weight is due to moisture. Ash: 2 grams are weighed in a flat platinum dish, and burned till white in a muffle below a red heat. The ash is then moistened with water, dried on sand bath, placed in muffle again for a short time, cooled in dessiccator and weighed. Nitrogen: A weighed quantity corresponding to twice the strength of the standard ammonia (near 2.8 grams) are placed in a Kjeldahl digestion flask, 1 gram salycilic acid, 20 c. c. of Kjeldahl sulphuric acid, and a small piece of paraffine added, mixed and warmed gently for a few minutes. 2 gr. of precipitated zinc sulphide added, and the neck of the flask rinsed with 10 c. c. more of the sulphuric acid. The flask is then gently warmed for 10 or 15 minutes and then boiled till the white fumes cease to come off, .5-.7 gram of metallic mercury is then added and the boiling continued till color |