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Updated: May 17, 2025
We may assume that these units are represented in the hereditary substance of the cell-nucleus by definite bodies of too small a size to be seen, but constituting together the chromosomes.
These "eating yelk-cells" are found in large numbers in the food-yelk of the Selachii, especially in the yelk-wall the border zone of the germinal disk in which the embryonic vascular net is first developed. The nuclei of the merocytes become ten times as large as the ordinary cell-nucleus, and are distinguished by their strong capacity for taking colour, or their special richness in chromatin.
The most recent of these hypotheses is that set forth by Verworn in his book “Die Biogenhypothese.” He assumes, as the central vehicle of the vital functions, a unified living substance, the “biogen,” nearly related to the proteids which form the fundamental substance of protoplasm and of the cell-nucleus, and in contrast to which the other substances found in the living body are in part raw materials and reserves, and in part of a derivative nature, or the results of disruptive metabolism.
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