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. 1 



Hatai, Shinkishi. On the length of the internodes in the sciatic nerve of 

 Rana temporaria (fusca) and Rana pipiens: — being a reexamination by 

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

 1908. With three text figures 19 



No. 2. APRIL 



Charles Brookover. The olfactory nerve, thenervus terminalisand the pre- 

 optic sympathetic system in Amia calva, L. With thirty-five figures 49 



Henry H. Donaldson. On the percentage of water in the brain and in the 



spinal cord of the albino rat. five figures 119 



S. J. Holmes. Pleasure, pain and the beginnings of intelligence 145 



No. 3. JUNE 



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 185 



Hansford MacCurdy. Degeneration in the ganglion cells of the crayfish, 



( Y'mbarus bartonii gir. With nine figures 195 



Albert Ktjntz. -The development of the sympathetic nervous system in 



mammals. With eighteen figures 211 



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

 cals 259 



iii 



