Mijake, The development of the gametophytes etc. 
3 
results and interpretations do not agree, and the opinions still differ 
among various inyestigators. In the present paper I have no in¬ 
ten tion to enter into a discussion of the disputed points; and the 
minute descriptions of these as well as other stages of the re- 
duction-diyision are not to be giycn. 
The chromosomes formed by the Segmentation of the spirem are 
found in pairs. The bivalent chromosomes now become short and thick 
(fig. 5). With the disappearance of the nucleolus and the nnclear 
membrane, the formation of the spindle begins. The spindle is at 
Text-fig. 1. Staminate cones ready for pollination, seen from the underside 
of a branch. About X 3 / 4 . 
first multipolar and later assumes the bipolar structure (figs. 6—8). 
The chromosomes then arrange themselyes at the equator of the 
spindle as shown in figs. 7 and 8. The number of the chromosomes 
can easily be counted at this stage, yiewing from a pole of the 
spindle. Their number, i. e., that of the bivalent chromosomes, is 
twelve, as it is usually the case with other Conifers (fig. 9). 
Each of the bivalent chromosomes, which are arranged at the 
equatorial plate, soon separates into two, and the daughter-chro- 
mosomes begin to move toward the poles. Very soon the chro¬ 
mosomes show the sign of longitudinal Splitting and, as they approach 
l* 
