124 THE CELL DOCTRINE. 



{Triton eristatus), that the statements of Flemming 

 are correct, and presents in addition several observa- 

 tions he has made with reference to the cell-sub- 

 stance itself, and the relation of it to the intranuclear 

 network. 



Dr. Klein examined gland-cells, surface epithelial 

 cells, endothelium, unstriped muscle-fibres, connec- 

 tive tissue corpuscles, and nerve-fibres. And every 

 where the nuclei showed an extremely beautiful net- 

 work of fibrils. This he designates as the intra- 

 nuclear network, which is imbedded in a homoge- 

 neous ground-substance. Tie network does not in 

 all instances extend up to the nuclear membrane, but 

 leaves a narrower or broader zone next to the mem- 

 brane unoccupied. But in all instances the network 

 is in connection with the limiting membrane by nu- 

 merous fibrils. The spaces formed by their anasto- 

 moses are not uniform, being sometimes larger in the 

 peripheral parts- than in the central, and sometimes 

 the reverse. All forms are found between a network 

 with fibrils as in a net, and a honeycomb of mem- 

 branous structure as in a sponge. In almost all in- 

 stances are observed a smaller or greater number of 



scopic fragments, a drop of glycerin is placed on a covering-glass, 

 and this is inverted over the above specimen. 



Examined under a moderately high power, say Hartnack's 7 or 

 8, or Zeiss's D or E, we recognize easily innumerable isolated cells 

 or groups of epithelial cells, and a great many isolated nuclei or 

 fragments of nuclei. If the scalpel has been drawn over the sur- 

 face of the mucous membrane with a little energy, the preparation 

 contains great numbers of gland-cells, isolated and in continuous 

 masses, and also other elements belonging to the tissue of the 

 mucosa. 



