46 THE ROYAL SOCIETY OF CANADA 



layer is very extensile and contractile and is readily regenerated upon 

 injury. Tearing of this surface, if unrepaired, results in the pouring 

 out of the internal cytoplasm and dissolution. 



2. The cytoplasm of the nerve cell exhibits, throughout its sub- 

 stance, the properties of the surface layer of the egg cell, viz., it con- 

 sists of a highly viscous, extensile, jelly-like hyaline substance. 



3. The resting nucleus of all the cells studied is a liquid sphere, 

 the external surface of which may form a more or less temporarily 

 rigid membrane. 



4. The production and maintenance of a limiting membrane 

 appears to be one of the properties essential to protoplasm. 



Literature. 

 Barber, M. A. 



1914. The pipette method in the isolation of single micro-organisms and 

 in the inoculation of substances into living cells. The Philippine Jour, of 

 Sc, vol. 9, Sec. B., Tropical Medicine, p. 307. 



Chambers, Robert. 



1917a. Microdissection Studies, L The visible structure of cell proto- 

 plasm and death changes. Am. Jour. Physiol., vol. 43, p. 1. 

 1917b. Microdissection studies, IL The cell aster, a reversible gelation 

 phenomenon. Jour. Exp. Zool., vol. 23, p. 483. 

 1918. The microdissection method. Biol. Bull., vol. 34, p. 121. 



Kite, G. L. and Robert Chambers. 



1912. Vital Staining of chromosomes and the function and structure of 

 the nucleus. Science, N.S., vol. 36, p. 639. 



Schmidt, A. D. - 



1859. On the minute structure of the hepatic lobules, particularly with 

 reference to the relationships between the capillary bloodvessels, the 

 hepatic cells, and the canals which carry off the secretion of the latter. 

 The Amer. Jour, of the Med. Sci., N.S., vol. 37, p. 2. 



