Abstract
1. The material used in this investigation is the pollen mother cells of jute (Corchorus capsularis, L.) which were fixed in BOUIN'S solution. Sections were cut at a thickness of 7 or 10 micron and stained in HEIDENHAlN'S iron-alum-haematoxylin. 2. With the beginning of the nuclear division, the nuclear contents contracts and separates from the nuclear membrane to form the synizesis stage (Fig. 1). At the end of the synizesis stage the contractad threads gradually begin to expand again in the nuclear cavity. Perhaps this is a pachytene atage. At the end of the pachytene stage the spimere gradually begins to split into two threads which are more or less twisted together. This is the diplotene stage (Figs. 2, 3 and 4). After continued thickening and shortening the twisted threads of the diplotene stage gradually become ring shaped cbromosomes of diakinesis (Fig. 5). 3. Sometimes, during the 1st prophase, a part of the spimere seems to be connected with the nucleolus. The connection between the spimere and the nucleolus can be clearly observed as the nucleolus is projecting out of the nucleus as shown in Fig. 8. Perhaps, during the prophase, the nucleolus may be connected indirectly with the whole spimere as shown by the explanatory diagrams of Figs. 9, 10 and 11. And a movement of chromatin may occur from the nucleolus to the connecting spimere to form the chromosomes.
