461 
The two series of experiments are made with parts of one and the 
game individual. Neither Mrs. DROOGLEEVER FortuyN—van LEYDEN, 
nor Mr. Karsten have done this, so the results lose reliability. 
Notwithstanding the incompleteness of my investigation, | thought 
the facts 1 found, of sufficient importance to be examined further, 
and for this reason | published this communication. At the same 
time I make use of the opportunity of thanking Mr. M. W. WOERDEMAN 
as well for the incitement to this research, as for the kind assistance 
lent to me. 
Amsterdam. Laboratory of Histology. 
