HOLMES'S "ANIMAL BEHAVIOR" 453 



Two chapters are devoted to the relation of form and behavior. 

 Reviewing his own experiments in conjunction with those of 

 Child, he concludes that the behavior of an organism plays but 

 a subordinate though important r61e in the determination of 

 its form. Under the title of Behavior of Cells the activity of 

 many migratory and motile cells is cited. It is suggested that 

 these activities are important in the development of form. 



The chapter on Death Feigning describes the wide distribu- 

 tion of this instinct. There are two types, — the cataleptic and 

 the paralytic. The former originated from the thigmotactic 

 response, while the fear hypothesis can apply only to the latter. 



The author discusses the sensory basis of sex recognition for 

 various species. Pie emphasizes the factor of behavior in many 

 forms. The sense used varies with the animal, while many senses 

 may be employed in the higher forms. The fact of sex is im- 

 portant in the evolution of mind. Given asexual reproduction, 

 mental evolution would have been different from what it was. 

 For example, voice, — the instrument of language, functioned 

 primarily as a sex call. 



The final chapter describes some experiments on a monkey. 

 The technique and the conclusions are similar to those of most 

 studies on this animal. 



In the preface we are told that the present volume is largely 

 devoted to subjects with which the writer's own investigations 

 in animal behavior have been more or less closely concerned. 

 This fact explains the choice of topics and the organization of 

 the book. It was probably intended more for supplementary 

 reading than as a text. Naturally the biological aspects of 

 behavior have been emphasized. 



