The Conjugation of the Infusoria . 463 
the ‘micro-’ and ‘macro-gametes’ male and female respect- 
ively. This is something which should be reserved for the 
terminology of Metazoan individuals, where the gametes differ 
in form, although they are, as demonstrated by Boveri and 
O. Hertwig, morphologically equivalent. In other words we 
are not entitled to speak of sex in the Infusoria hitherto 
investigated. 
Woodcut 13. 
Vorticella (after Maupas). 
Before venturing on an interpretation of the whole process 
in Vorticella , I should like to pay a tribute of admiration to 
Maupas 5 brilliant researches. They stand out prominently 
among the published results of recent years as marvels of 
patience, exactitude, and morphological insight. It is a 
somewhat painful position to find one’s self in, that of 
attempting to take a little of the cream from other people’s 
researches. Some slight excuse may perchance be found in 
the circumstances that several years of my life have been 
devoted to the solving of this puzzle of the mode in which 
K k 2 
