847 
3rd, as a so-called bio-chemical condensation. 
According to this differentiation potassium occurs in the anterior, 
and the posterior cortical layer as a local precipitate, in the inner 
layer, however, in biochemical condensation. 
The local precipitate is to be found especially round the nuclei 
of the two cortical layers and on the boundary of the anterior 
cortical layer and the inner layer, while in the latter the potassium 
has been condensed in the originally doubly refracting discs. 
The most interesting facts brought to light by this experimentation 
are, in my judgment, 1%‘. the potassium-richness of the electric platelets 
and the slight quantity of potassium in the surrounding jelly ; 
2ed, the occurrence of a large precipitate of potassium on the boun- 
dary between the anterior cortical layer, and the inner layer, and 
3. the fact, that in the inner layer the peculiar distribution of the 
potassium-compounds, found in voluntary muscular tissue, has been 
maintained. The physiological explanation of these facts will, as I 
hope, be given by those who are competent to do so. 
Histological Laboratory of the Amsterdam University. 
