496 GENCHO FUJIMURA 



itself into a large number of lumps, each of nearly equal size. 



In figure 5 there are no plastosomes to be found, but the lipoid 

 granules occur in extremely large quantities, and their sizes 

 are nearly the same. They are found more or less in groups 

 and are distributed all over the layer. At the same time the 

 vacuoles make their appearance in a conspicuous manner, some- 

 times on the surface, sometimes in the innermost part, and some- 

 times in the middle, and they are about the same size as the lip- 

 oid granules. As is well known, it is in general very difficult 

 to stain the plastosomes every time, and, therefore, accurately 

 to determine their existence and where they are entirely want- 

 ing, as in this figure, it would be a very difficult task indeed. 

 I have paid the closest attention to this, and have always 

 selected for it the most excellent preparations for staining, 

 with a view of doing away with all the possible defects in the 

 technique of- staining. From the existence, in a very conspic- 

 uous manner, of plastosomes in the neighboring tissues, entirely 

 in contrast to this figure, I was prompted to conclude that it 

 was well nigh necessary for me to assert the absolute lack of 

 plastosomes in this part of the syncytium layer. Further, I 

 may add that, as will be noted below, the same amount of -atten- 

 tion has been given all the other cells where there are no plas- 

 tosomes to be found, and I, on this score, am convinced that my 

 observations concerning them are not erroneous. 



In figure 6, the surface is somewhat light-colored and is clear. 

 In it there are found innumerable quantities of vacuoles which 

 are nearly of the same size, besides a small number of lipoid 

 granules. The innermost part, however, is of a comparatively 

 dark color, and it likewise contains innumerable quantities 

 of minor lipoid granules of about the same size, with very few 

 vacuoles which are generally of small size. Some of the nuclei 

 are oval, while others are irregular in their shape, and there 

 is to be found a great number of chromatin granules which 

 make their appearance in lumps of different sizes; the nuclear 

 networks are usually less conspicuous. There are absolutely 

 no plastosomes to be found. 



