SOME OBSERVATIONS ON ACINETARIA. 367 
became more inclined to the view that normally one micro- 
nucleus develops into the new macronucleus, one remains as 
the new micronucleus and two degenerate (Scheme ITI). 
At is quite possible that both these methods of reconstruc- 
tion occur normally since Prandtl has shown recently in a 
very careful work on conjugation in Didinium nasutum, 
Tex?-FIGURE 6.—A. papillifera, first stage of conjugation, 
showing the prolongations (C.P.) by which contact between con- 
jugating individuals is effected. Ma. Macronuclei. (Zeiss 2 mm. 
apochr., comp. oc. 6.) 
that here the nuclear apparatus may be restored by one out 
of no less than five different methods, and Hickson has 
described three alternative methods in Dendrocometes. 
The first indication of conjugation was found by Professor 
Minchin among specimens collected and examined on August 
29th, and the majority of the individuals fixed at this period 
were found on examination to be early stages A—E. Ihave 
VOL. 53, PART 2.—NEW SERIES. 26 
