xii CONTENTS 
No. 3. SEPTEMBER 
CHARLES W. Haraittr. Some problems of coelenterate ontogeny. Three 
placesiand three text figures... 5.2. .0sneh ede dod ogee ne ee ee 493 
Victor E. SuHetrorp. Physiological animal geography. Nineteen figures... 551 
“R.M. Stronc. On the olfactory organs and the sense of smell in birds. Two 
piatessand four text. figures: } as teeden oe Cems 2.2 se es ae ree ee eee 619 
Henry H. Donaupson. On the regular seasonal changes in the relative 
weight of the central nervous system of the leopard frog. Five charts... 663 
Raupy 8S. Linu. The physiology of cell-division. IV. The action of salt 
solutions followed by hypertonic sea-water on unfertilized sea-urchin 
eggs and the role of membranes in mitosis. Three figures............. 695 
Tuos. H. Montcomery, Jr. The spermatogenesis of an hemipteron, Eus- 
chistus. . Five plates——147 rures £5) Foo uiac c= x0 toy selon Som Ree eee 731 
WINTERTON C. Curtis. The life history of the Scolex polymorphus of the 
Woods, Hole region: ( Thirteen tipuresis.. fac. one ot aa oes e eee 821 
No. 4. DECEMBER 
H. H. Newman and J. THomas Patrerson. The limits of hereditary control 
in armadillo quadruplets: A study of blastogenic variation. Five figures 
ANG MTOM ALCS Ses. hate. Lie ers. Soc see oan aie auch ot one ee eee 855 
CHARLES ZELENY. Experiments on the control of asymmetry in the develop- 
ment of the serpulid, Hydroides dianthus. Seven figures................ 927 
Wiuuiam A. Locy. Anatomical illustration before Vesalius. Twenty-three 
AUGER) MarR: | dew accasctere qe reels nt oie Ertng ieter rant ag o aoa ee 945 
S. J. Hommes. Minimal size reduction in planarians through successive re- 
(a SOL SS SERIO eset ae eel Coe IAD Seay | iene AN) cee AU RE Rares Site Id Clon nc 989 
E. H. Harrer. The geotropism of Paramoecium. Five figures............. 993 
ELuiot RowLAND DowniNna. The formation of the spermatophore in Areni- 
cola and a theory of the alternation of generations in animals. Four 
platesandiseven text feuKes. oe. esc. s - oie siete ote dete ato re Cera ea ae 1001 
Biography, Charles Otis Whitman. Five portraits............... ....+..+-- XV 
