CONTENTS

1910

No. 1. FEBRUARY

DONALDSON, HENRY H. Further observations on the nervous system of the

American leopard frog, Rana pipiens, compared with that of the Euro-

pean frogs, Rana esculenta and Rana temporaria. With two text figures.

HATAI, SHINKISHI. On the length of the internodes in the sciatic nerve of

Rana temporaria (fusca) and Rana pipiens:-being a reëxamination by

biometric methods of the data studied by Boycott, 1904, and Takahashi,

1908. With three text figures..

No. 2. APRIL

CHARLES BROOKOVER. The olfactory nerve, the nervus terminalis and the pre-

optic sympathetic system in Amia calva, L. With thirty-five figures

HENRY H. DONALDSON. On the percentage of water in the brain and in the

spinal cord of the albino rat. five figures..

S. J. HOLMES. Pleasure, pain and the beginnings of intelligence

No. 3. JUNE

HANSFORD MACCURDY. Degeneration in the ganglion cells of the crayfish,

Cambarus bartonii gir. With nine figures....

1

H. H. T. JACKSON. The control of phototactic reactions in Hyalella by chemi-

cals.

19

OTTO C. GLASER. The formation of habits at high speed, With two figures... 165

I. W. BLACKBURN. On the median anterior cerebral artery as found among the

insane. With six figures..

49

119

145

185

ALBERT KUNTZ. The development of the sympathetic nervous system in

mammals. With eighteen figures..

211

195

259

No. 4. AUGUST

C. W. PRENTISS. The development of the hypoglossal ganglia of pig embryos.

Eight figures.

ALBERT KUNTZ. The development of the sympathetic nervous system in

birds. Ten figures..

283

F. L. LANDACRE. The origin of the cranial ganglia in Ameiurus. Eighty-

eight figures

No. 5. OCTOBER

C. JUDSON HERRICK. The morphology of the forebrain in Amphibia and Rep-

tilia. Eighty-four figures.

No. 6. DECEMBER

KARL T. WAUGH. The rôle of vision in the mental life of the mouse. From

Beloit College. Ten figures..

LAWRENCE W. COLE. Reactions of frogs to chlorides of ammonium, potassium,

sodium and lithium..

SERGIUS MORGULIS. The movements of the earthworm. Two figures..

EDITORIAL ANNOUNCEMENT.

C. W. PRENTISS. The development of the hypoglossal ganglia of pig embryos.
eight figures..

ALBERT KINTZ. The development of the sympathetic system in birds. Ten

figures

265

F. L. LANDACRE. The origin of the cranial ganglia in Ameiurus. Eighty-
eight figures..

309

414

549

601

615

625

265

283

309

CONTENTS

1910

NOTICE

Use the Contents and Index herewith in bind-
ing Volume 20, as the sheets sent out with No. 6 are
incorrect.

ALBERT KUNTZ. The development of the sympathetic nervous system in

mammals. Eighteen figures..

211

HARTLEY H.T. JACKSON. The control of phototactic reactions in Hyalella by

chemicals...

259