Abstract
THIS work is a careful cytological study of spermatogenesis in a Hemipteran insect, but it is much more; for it includes a discussion of literature in all the related fields of plant and animal cytology. After some sixty pages giving a critical account of spermatogenesis in this insect, the remainder of the volume is devoted to a discussion of such questions as the structure of chromosomes, hypotheses of chromosome phylogeny, chromosome persistence and composition, the ‘resting’ period between mitoses, chromosome splitting, the method and meaning of chromosome conjugation, the nature of genes, and other questions. The views and observations of others are freely cited, making the work a very useful one in comparative cytology.
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