502 GENCHO FUJIMURA 



granules of various sizes within; in figure 25 and 26 the 

 bodies are vacuolated to the highest degree, and it is perfectly 

 plain that the vacuoles which are extremely varied in size and 

 shape mix together and grow larger, thus giving the cell 

 bodies the appearance of a honey comb in a striking manner. The 

 large and highly vacuolated cells such as are illustrated in figures 

 21, 25, and 26 are very frequently met with in the Langhans' 

 islets. 



The various structural images in the Langhans' cells that I 

 have described above make their appearance in a most remark- 

 able manner from the , end of the first month of pregnancy to 

 the end of the third month ,and in the fourth month, though 

 the plastosomes are still existent in a remarkable degree, the 

 hpoid granules and vacuolar formations are no linger conspicu- 

 ous, and in the following months not only do the cells decrease 

 suddenly, but also these materials component of the cell bodies 

 disappear, though the cells in the Langhans' islets retain those 

 structures as long as they exist. 



3. The stroma cells of villi {figs. 27 to 38) 



The smallest of the stroma cells of vilH, as is illustrated by 

 figure 27, are mostly ball-shaped and have the nucleus of a 

 similar shape within. In the cell bodies there are plastosomes, 

 mostly rod-shaped. Figures 28 and 29 are nearly the same 

 as figure 27 in their shape, though the one contains in the cell 

 body a somewhat large quantity of lipoid granules of different 

 sizes, while the other has a small quantity of extremely small 

 lipoid granules and an equally small quantity of small vacuoles. 

 Figures 30 to 38 illustrate the cells arranged in their approximate 

 order of size and, though their shape and structure appear ex- 

 tremely varied at a glance-, it will be found on close examination 

 that, with the exception of figure 34, there is a structure which is 

 common to nearly all the rest, the only difference between them 

 being principally the size and number of vacuoles contained in 

 the cell bodies. Generally speaking, the larger sized-cells have 

 vacuoles which are naturally large in size and number, and the 

 fact that large vacuoles are built up to some extent from 



