STUDIES IN THE EXPERIMENTAL ANALYSIS OF SEX. 439 
Studies in the Experimental Analysis of Sex. 
Part 8. — On the Effects of the Removal and Transplantation of 
the Gonad in the Frog (Ran a fuse a). 
By 
Geoffrey Smith. M.A., 
Fellow of New College, Oxford ; and 
Ed^ r ar Schuster, M.A., D.Sc., 
Fellow of New College, Oxford. 1 
With Plates 43-46. 
The experiments described in this paper were performed 
in the Department of Pathology, and we are indebted to 
Professor Dreyerfor invaluable advice as to the best methods 
of carrying* them out. The large material derived from the 
experiments and from normal animals was examined and 
worked up in the Department of Comparative Anatomy. 
Nussbaum, who made a series of parallel experiments some 
years ago, did not anaesthetise his animals, and recommends 
a special method for preventing the animal, when it is operated 
on, from blowing its lungs out into the abdominal incision. 
In all our experiments the frog was anaesthetised with ether, 
and it was then found unnecessary to take any further 
precautions. An opening was made into the abdominal cavity 
by a longitudinal incision on one side of the anterior 
abdominal vein, the testis or ovary of both sides was removed, 
and in certain cases a testis from the same animal, or from 
1 The experiments for this paper were performed by G. S. The chief 
part of the examination of the sections and all the drawings are the 
work of E. S. 
