STUDIES IN THE EXPERIMENTAL ANALYSIS OF SEX. 265 
Sacculina exerts on all the characters of Carcinus com- 
pared with its effects on Inachus. 
(6) The investigation shows that Sacculina exerts a 
marked influence on the fat-metabolism of the host, and the 
results are on the whole consistent with the view that 
Sacculina influences the host to assume the female charac- 
ters by acting the same part in the fat-metabolism as the 
ripening ovary does in a normal female. 
Literature. 
1. Heim. F. — “Theses presentees a la Faculte des Sciences de Paris,*' 
‘ Etudes sur le Sang des Crustaces Decapodes,’ Paris, 1892. 
2. Leatlies, J. B. — ‘ The Fats.’ Monographs on Bio- Chemistry. 
London, 1910. 
