An electron microscopic examination has been made of the testis of the cockroach after
fixation with glutaraldehyde. The tubular components of the spindle of cells in the first …

Thin sections of the testicular follicles of the grasshopper Laplatacris dispar were studied
under the electron microscope. In the primary spermatocytes, during meiotic prophase, three …

The fine structure of the mature spermatozoon of the insect Thermobia domestica has been
investigated. This flagellate spermatozoon is unique with respect to the relative positions of …

Thin sections of the testicular follicles of the grasshopper Laplatacris dispar were studied
under the electron microscope. In the primary spermatocytes, during meiotic prophase, three …

In the heads of maturing sperm of a locust the chromatin becomes arranged in a highly
regular manner so as to produce many parallel lines about 60 A thick in longitudinal section …

1. In Euschistus the mitochondrial material of the primary spermatocytes occurs in the form of
threads which are definitely oriented toward the centrioles in the prophases of the …

The structure of the nuclei of the spermatogonia, spermatocytes, and the nuclear changes
during the division of the spermatocytes are described. The nucleolus of the spermatocytes …

An electron microscopic investigation was made of the origin and morphology of the canal
system that connects sister spermatocytes of larval Bombyx mori. Canal formation results …

The movement of chromosomes and the changes in spindle size have been recorded in
living spermatocytes of the grasshopper during the meiotic divisions. Anaphase movement …

Observations on the morphological changes of mitochondria preparatory to the formation of
the nebenkern, as well as changes within the nebenkern, are reported. 2. Mitochondria …