ui 



dickt sich nach und nach zu den Elementen des Nagelsaumes") which 

 cells he had previously described as heaped up „Blasenzellen". 



Figure 3 represents a section of the end of the ring finger 

 of an embryo between 3 and 4 months of age, stained by the acid 



^0 a 



^_.-_ 



Fig. 3. Third fin- 

 ger of an embryo of 

 the 3r^ month, e out- 

 er or epitrichial cells, 

 greatly multiplied at 

 the nail edge (ne) and 

 forming the epony- 

 ehium («o) above the 

 nail formation (»). 

 Acid fuchsine prepa- 

 ration. 



fuchsine method. A continuous outer layer of granular and bladder 

 cells is distinctly seen covering the entire finger, at the edge of 

 the nail these bladder cells being heaped up in several layers. 

 At n is seen the first appearance of the nail, stained a deep red 

 by the acid fuchsine, and above it the eponychium of Unna, 

 which is made up of bladder cells several rows deep, with greatly 

 thickened margins. These epitrichial cells, moreover, both those 

 above the nail and on the free surface, are stained a dull red from 

 the coloring matter, while the cells of the rete below are barely 

 visible. With a high power this specimen shows plainly the deeply 

 stained granules lying in peculiar cells in the upper part of the rete, 



[•-.'•'■•■•a i: "•■■•..:■ , • ::•:■■' "/.■>' *»;.•■»:• '^v 



Fig. 4. Fourth toe of an embryo of the fourth month, t outer or epitrichial cells, 

 forming the nail edge (ne) and the eponychium (eo). n nail formation. Acid fuchsine 

 preparation. 



