STUDIES IN THE EXPERIMENTAL ANALYSIS OF SEX. 295 
tion of ova in the regenerated testis of infected males? It is 
no part of the Hormone theory that the liormone which the 
reproductive organ produces is itself the condition of forma- 
tion of that reproductive organ, but it is an integral part of 
our theory that the substances produced in the blood for the 
nutrition and for purveying the nutrition of the Sacculina 
roots (or ovary of the crab), act as one and the same stimulus 
for the development of the secondary sexual characters and 
for the growth of the Sacculina roots (or ovary). The 
probing of the facts of parasitic castration, therefore, may 
lead ns to the conviction that the Hormone theory in its 
generally accepted form, whatever may be its fate in other 
branches of inquiry, is destined only to play upon the shallows 
and not to illuminate the depths of the physiology of repro- 
duction. 
Literatuee. 
1. Smith, Lorain and Mair. — “ Fats and Lipoids in Relation to 
Staining,” ‘ Skandinavisches Archiv fi'ir Physiol.,’ Bd. xxv, 1911. 
2. Smith, G. — “ Studies in the Experimental Analysis of Sex : Part 7,” 
‘ Quart. Journ. Micr. Sci.,' vol. 57, 1911, p. 251. 
3. Robson, G. — The Effect of Sacculina upon the Fat Metabolism of 
its Host,” ibid., vol, 57, 1911, p. 267. 
4. Newbiggin, J. M. — “The Role of Pigment,” ‘Report of Scottish 
Fishery Board on the Salmon,’ Glasgow, 1898. 
5. Potts, F. A. — “ The Effect of Peltogaster on its Host,” ‘ Quart. 
Journ. Micr. Sci.,’ vol. 50, p. 599, 1906. 
6. “ The Effect of Sacculina on Carcinus,” ‘ Cambridge Philo- 
sophical Society,’ vol. xv, Part ii, p. 96, 1909. 
7. Pfliiger, E. — ‘ Pfliiger’s Archiv f. Ges. Physiol.,’ vol. ciii, p. 169, 
1904. 
8. Leathes, S. — “ The Fats,” ‘ Biochemical Memoirs,’ 1910. 
9 . Ehrlich, P. — ‘Studies in Immunity,’ 1906. 
10 . Smith, G. — ‘ Zoologischer Anzeiger,’ vol. xli, p. 623, 1913. 
11. Sexton and Matthews. — “Notes on the Life History of Gam mar ns 
chevieuxi,” ‘ Journal of the Marine Biological Association,’ vol. 
ix, No. 4, p. 546, 1913. 
