496 



INDEX 



HEART. The physiology of the nervous 

 system of the tunicate. II. The rela- 

 tion of the nerve ganglion to the 45 



Heilbrunn, L. V. Protoplasmic viscosity 

 changes during mitosis 417 



Hemolymph color in Colias (Eurymus) 

 philodice. Blue-green caterpillars: the 

 origin and ecology of a mutation in 385 



Hopkins, Hoyt S. The conditions for con- 

 jugation in diverse races of Paramecium. . 339 



Ht.m.\n, Libbie H., AiN'D G.\LiGHER, Albert E. 

 Direct demonstration of the existence of 

 a metabolic gradient in annelids . 1 



Hypophysis to pigmentation changes in 

 anuran larvae. The relation of the pars 

 intermedia of the 119 



INFUSORIA. Micronucleate and amicro- 

 nucleate races o 329 



Infusoria. II. The role of molecule and of 

 ions. The toxicity of acids to 67 



Infusoria. HI. Antagonism of the toxic ac- 

 tion of acids by inorganic chlorides. The 

 toxicity of acids to _. 75 



Internodes of Obelia commissuralis. Experi- 

 mental control of organic polarity by the 

 electric current. I. Effects of the electric 

 current on regenerating 471 



Ions'. The toxicity of acids to Infusoria. II. 

 The role of molecule and of . .^ 67 



LARVAE. Experiments on the orientation 

 of the ear vesicle in amphibian 17 



Larvae of the ascidians, Amaroiicium constel- 

 latum and Amaroucium pellucidum, with 

 special reference to photic orientation. 

 Reactions to light in the 149 



Larvae. The relation of the pars intermedia 

 of the hypophysis to pigmentation 

 changes in anuran . 119 



Law. The photic reactions of tadpoles in 

 relation to the Bunsen-Roscoe 235 



Light in the larvae of the ascidians, Amarou- 

 ,_ium constellatum and Amaroucium pel- 

 lucidum, with special reference to photic 

 orientation. Reactions to _. . 149 



Lizards. Studies in reptilian spermatogenesis. 

 I. The spermatogenesis of . 281 



Lund, E. J. Experimental control of organic 

 polarity by the electric current. I. Ef- 

 fects of the electric current on regener- 

 ating internodes of Obelia commissuralis. 471 



MAST, S. O. Reactions to light in the 

 larvae of the ascidians, Amaroucium 

 constellatum and Amaroucium pel- 

 lucidum, with special reference to photic 

 orientation 149 



Metabolic gradient in annelids. Direct 

 demonstration of the existence of a 1 



Micronucleate and amicronucleate races of 

 Infusoria 329 



Mitosis. Protoplasmic viscosity changes 

 during 417 



Mobilis Engelm. IV. Effect of cutting dur- 

 ing conjugation. Uroleptus 449 



Molecule and of ions. The toxicity of acids 

 to Infusoria. I. The role of 67 



Multiple allelomorphs of Drosophila. The 

 direction and frequency of mutation in 

 the bar-eye series of 203 



Mutation in hemolymph color in Colias 

 (Eurymus) philodice. Blue-green cater- 

 pillars: the origin and ecology of a 385 



Mutation in the bar-eye series of multiple 

 allelomorphs of Drosophila. The direc- 

 tion and frequency of 203 



NERVE ganglion to the heart. The physi- 

 ology of the nervous system of the tuni- 

 cate. II. The relation of the 45 



Nervous system of the tunicate. II. The 

 relation of the nerve ganglion to the 

 heart. The physiology of the 45 



OBELIA commissuralis. Experimental con- 

 trol of organic polarity by the electric 

 current. I. Effects of the electric cur- 

 rent on regenerating internodes of 471 



Obreshkove, Vasil. The photic reactions 

 of tadpoles in relation to the Bunsen- 

 Roscoe law 235 



Og.\wa, Chikanoscke. Experiments on the 

 orientation of the ear vesicle in amphibian 

 larvae 17 



Organic polarity by the electric current. 

 I. Effects of the electric current on regen- 

 erating internodes of Obelia commis- 

 suralis. Experimental control of 471 



Organisms. Some factors influencing the 

 catalase content of 14 



Orientation of the ear vesicle in amphibian 

 larvae. Experiments on the 1 



Orientation. Reactions to light in the larvae 

 of the ascidians, Amaroucium constel- 

 latum and Amaroucium pellucidum, with 

 special reference to photic 149 



Origin and ecology of a mutation in hemo- 

 lymph color in Colias (Eurymus) philo- 

 dice. Blue-green caterpillars: the 385 



PAINTER, Theophilus S. Studies in 

 reptilian spermatogenesis. I. The 

 spermatogenesis of lizards 281 



Paramecium. The conditions for conjugation 

 in diverse races of 339 



Pars intermedia of the hypophysis to pigmen- 

 tation changes in anuran larvae. The 

 relation of the 119 



Pearl, Ray.mond, and Schoppe, William 

 Freeman. Studies on the physiology of 

 reproduction in , the domestic fowl. 

 XVIII. Further observations on the ana- 

 tomical basis of fecundity 101 



Pellucidum, with special reference to photic 

 orientation. Reactions to light in the 

 larvae of the ascidians, Amaroucium 

 constellatum and Amaroucium 149 



Philodice. Blue-green caterpillars: the origin 

 and ecology of a mutation in hemolymph 

 color in Colias (Eurymus) 385 



Photic orientation. Reactions to light in the 

 larvae of the ascidians, Amaroucium 

 constellatum and Amaroucium pelluci- 

 dum, with special reference to 149 



Photic reactions of tadpoles in relation to the 

 Bunsen-Roscoe law. The 235 



Physiology of reproduction in the domestic 

 fowl. XVIII. Further observations on the 

 anatomical basis of fecundity. Studies 

 on the 101 



Physiology of the nervous system of the tuni- 

 cate. II. The relation of the nerve gan- 

 glion to the heart. The 45 



Pigmentation changes in anuran larvae. The 

 relation of the pars intermedia of the 

 hypophysis to 119 



Polarity by the electric current. I. Effects 

 of the electric current on regenerating 

 internodes of Obelia commissuralis. 

 Experimental control of organic 471 



Protoplasmic viscosity changes during mitosis. 417 



