CONTENTS 



NO. 1. JANUARY 



IMaroaret Morris. A cytological study of artificial parthenogenesis in 



Cumingia. Four text figures and eight plates 1 



A. A. ScHAEFFER. On the reactions of ameba to isolated and compound pro- 

 teins. Six plates 53 



G. H. Parker. Nervous transmission in the actinians. Three figures 87 



G. H. Parker. The movements of the tentacles in actinians. One figure. . 95 



G. H. Parker. Pedal locomotion in actinians. One figure Ill 



Raymond Pearl. The experimental modification of germ cells. I. Gen- 

 eral plan of experiments with ethyl alcohol and certain related sub- 

 stances. Three figures 125 



Raymond Pearl. The experimental modification of germ cells. II. The 

 effect upon the domestic fowl of the daily inhalation of ethyl alcohol 



and certain related substances. Four figures 165 



Jacques Loeb and Hardolph Wasteneys. A reexamination of the appli- 

 cability of the Bunsen-Roscoe law to the phenomena of animal helio- 

 tropism 187 



NO. 2. FEBRUARY 



G. H. Parker. Actinian behavior 193 



Elizabeth S. P. Redfield. The rhythmic contractions in the mantle of 



lamellibranchs. Four figures 231 



Raymond Pearl. The experimental modification of germ cells. III. The 

 effect of parental alcoholism, and certain other drug intoxications, upon 

 the progeny. Seven figures 241 



Edwin G. Conklin. Effects of centrifugal force on the structure and de- 

 velopment of the eggs of Crepidula. One hundred and twenty-four fig- 

 ures 311 



Geo. T. Hargitt and Walter W. Fray. The growth of Paramaecium in 



pure cultures of bacteria 421 



Walter W. Marshall and Hermann J. Muller. The effect of long-con- 

 tinued heterozygosis on a variable character in Drosophila. Two figures. 457 



NO. 3. APRIL 



S. O. Mast. The relation between spectral color and stimulation in the 



lower organisms. Four figures 471 



Waldo Shumway. The effects of a thyroid diet upon Paramaecium. Twelve 

 figures 529 



