WENRICH: SPERMATOGENESIS OF PHRYNOTETTIX MAGNUS. 125 
D. SumMMARY OF CONCLUSIONS. 
It is believed that the present study of the spermatogenesis of 
Phrynotettix magnus has demonstrated: — 
1. That conjugation of the chromosome-pairs is by parasynapsis. 
2. That the majority of the bivalent chromosomes divide equa- 
tionally in the first maturation division. 
3. That the chromosomes retain their individuality through the 
spermatogenic cell-generations. 
4, That the so-called ‘plasmosomes’ take their origin from some 
definite region (granule) of particular chromosomes, but that they 
may be variable in occurrence and in extent of development. 
5. That in the maturation divisions (e. g. chromosome-pair C;) 
the law of chance is followed in the distribution of the chromosomes. 
6. That each chromosome possesses a definite organization, which 
is expressed in the constancy of the relative sizes and positions of its 
chromomeres (as seen, eé. g., in chromosome-pair B). 
In addition, the possibilities are suggested that: — (1) the matter 
of the behavior of unequal pairs of chromosomes in regard to distribu- 
tion and recombination may be tested by breeding experiments, (2) 
the constancy in the arrangement of chromomeres along the length 
of the chromosome-threads, as described for chromosome-pair B, 
may have a meaning related to that suggested by Morgan’s “linear- 
arrangement” hypothesis, and (3) that in the varying types of chromo- 
some-pair C there may exist a mechanism for the transmission of 
multiple allelomorphs. 
