CONTENTS 
1912 
No: 1.)' JANUARY 5 
. 
Epwin G. Conxuin. Cell size and nuclear size. Thirty-seven figures...... 1 
- Raymonp Peart anp Maynie R. Curtis. Studies on the physiology of 
reproduction in the domestic fowl. V. Data regarding the physiology 
Of Che rout ne teem R OUR UNS s cet. «'. .n,u «a. eee y tarde eae Sa hee eee 99 
L. B. Nick. Comparative studies on the effects of alcohol, nicotine, tobacco 
smoke and caffeine on white mice. I. Effectson reproduction and growth. 
OWAVERM Gy) AD Lethe Sens DOr Ae Ve a MP Mr Ad MO on PML, ac ae el fod het 133 
No. 2. FEBRUARY 10 
Frank W. Bancrorr. Heredity of pigmentation in Fundulus hybrids. 
Whirby HeMres so sycsets Wess oh 4 RRP SE Psi con fue ee 153 
Puit Rav anp NEuuie Rav. Longevity in Saturniid moths; an experimental 
SUC yes VieMIOUTES..2 Rise, Sota tarot ec he, sine Cetera cate rey Gusta saeg ek cena a 179 
LoraNbDE Loss Wooprurr. Observations on the origin and sequence of the 
protozoan fauna of hay infusions. Fifteen figures.................... 205 
Morais 8. Frnt. Chemical properties of hay infusions with special reference 
to the titratable acidity and its relation to the protozoan sequence. Five 
A. FRANKLIN SHULL. Studies in the life cycle of Hydatina senta. III. 
Internal factors influencing the proportion of male-producers. Six 
