SEX SPECIFIC ACTION OF HORMONES 313 



ductus ejaculatoriuswere always normal. Kopec made similar 

 feminization and masculinization experiments using younger 

 caterpillars than those employed by Meisenheimer (cater- 

 pillars immediately after the first moulting); he also made 

 repeated transplantation experiments. The grafts "took" and 

 the testicles even showed an hypertrophy; histologically they 

 were like the normal organ. But no influence of the engrafted 

 testicle or ovary on the host of the other sex was ever seen. 

 Injections of blood or of a pulp from the gonad of the other 

 sex into castrated caterpillars made by Kopec also had no 

 influence even though great quantities were injected. 



Experiments on the fiddler crab have been performed by 

 Morgan (1920). Boring a hole in the carapace of the male crab 

 he inserted pieces of the ovary taken from a female fiddler; he 

 also did the converse experiment. The small pieces engrafted 

 often got lost, and it coald not be determined subsequently how 

 far the graft degenerated and how far it grew, but no effect was 

 ever produced on the claws. 



The state of things in the Arthropoda seems to be wholly 

 different from that in mammals. It is of course conceivable 

 that in the Arthropoda the endocrine cells which produce the 

 sexual hormones are widely separated from the gonad or the 

 generative cells. 



BIBLIOGRAPHY FOR CHAPTER VI. 



[* Not seen in the original.] 



Athias. 1915. L'activite secretoire de la glande mammaire hyper- 

 plasee, chez le cobaye male chatre, consecutivement k la 

 greffe de I'ovaire. C. R. de la Soc. de Biol, 78, p. 410. 



1916. Sur le determinisme de I'hyperpiasie de la glande mam- 



maire et de la secretion lactee. C. R. de la Soc. de Biol., 79, 

 p. 557. 



BiERENS DE Haan. 1922. Die Korpertemperatur jmiger Wander- 

 ratten (Mus decmnanus) und ihre Beeinflussimg durch die 

 Temperatm- der Aussenwelt. Arch. f. Entw.-Mech., 50, p. 1. 



BoRMANN. 1922. tJber die Folgen der Kastration in ihren zeitlichen 

 Beziehungen. Skandinav. Arch. f. Physiol., 42, p. 240. 



Brunnow und Savary. 1923. Uber den Unterschied in der 



Korpertemperatur beim mannlichen luid weiblichen Kanin- 

 chen und fiber die Abhangigkeit der Korpertemperatur von 

 den Geschlechtsdriisen. Skandin. Arch. /. Physiol, 4:4:, p. 248. 



