No. 2 — Continued. 



W. A. Math EN Y 



Effects of alcohol on the life cycle of parameciuni. With one figure. . , 19:5 



N. M. Stevens 



The chromosomes in the germ cells of culex. With fifty-two figures 207 



N. M. Stevens 



An unequal pair of heterochromosomes in forficula. With torty- 

 eight figures 227 



No. 3 — May, 1 910 



A. M. Banta 



A comparison of the reactions of a species of surface isopod with those 

 of a subterranean species. Part i. Experiments with tiglit. With 

 six figures 243 



Aaron Franklin Shull 



Studies in the life cycle of hydatina senta. i. Artificial control of the 

 transition from the parthenogenetic to the sexual method of reproduc- 

 tion. With one figure J 311 



No. 4 — June, 1 9 10 



E. Newton Harvey 



The mechanism of membrane formation and other early changes in 

 developing sea-urchins' eggs, as bearing on the problem of artificial 

 parthenogenesis. With two figures 355 



William Morton Wheeler 



Ihe effects of parasitic and other kinds of castration m msects. With 

 eight figures 377 



A. M. Banta 



A comparison of the reactions of a species ot surface isopod with those 

 of a subterranean species. Part li. Experiments with mechanical 

 stimulation 439 



A. H. EsTABROOK 



Effect of chemicals on growth in paramecium. With one figure 489 



G. H. Parker 



Olfactory reactions in fishes 533 



