HEREDITY IN THE PROTOZOA 307 
of the individual chromosomes has not been demon- 
strated. There is, it is true, one case at least—in 
flagellates—in which the evidence seems to show 
that segregation takes place after conjugation. It 
has been shown by Pascher that when two species of 
Chlamydomonas conjugate and then encyst (Fig. 72) 
the resulting cyst is unlike the cyst of either parent, 
and may be said to be intermediate. While in the 
cyst, a reduction division occurs, and four new 
individuals emerge. These then multiply by fission. 
The offspring show the parental characters combined 
in different ways. Some of the individuals are like 
the parent species, others show recombinations of 
the original characters. The results, if confirmed, 
furnish evidence of segregation, but the numerical 
relations between the different. types produced by 
each cyst are unknown. 
