100 THE AMERICAN MONTHLY [June, 



Bacilli, methods of growing and staining them and methods of 

 inoculating animals with the bacilli as well as of examining 

 animals dead of the disease. 



BACTERIOLOGY* 



Tuberculosis Culture Medium. — Used in the Department 

 of Agriculture : Distilled water, 1000 c.c, (1 quart); magnesium 

 sulphate, 0.2 gramme (3 grains); acid potasium sulphate 1.0 

 gramme (15-2 grains) ; sodium chloride, 10 grammes (2* 

 drachms); asparagin, 2 grammes, (31 grains); glycerine 70 c.c. 



(2i OZ.). E. A. DE SCHWEINITZ. 



BIOLOGICAL NOTES. 



Living Nerve-Cell During Stimulation. — Hodge has made 

 a microscopical study of the nerve-cell during the process of fa- 

 tigue. He finds that the nucleus shrinks, when stimulated un- 

 der these conditions, more rapidly than when the ganglion re- 

 mains in the animal's body. Decrease in size is at first rapid, 

 then slower and more rapid again. The slowing up at no time 

 amounts to stand-still or to partial recover}'. The controls 

 shrink very little, 3 to 8 per cent as compared with GO to 73 per 

 cent in the nuclei of stimulated ganglia. Granules and oil- 

 droplets have been seen to disappear from the cell protoplasm 

 during stimulation. 



DIATOMS. 



Washing Diatoms. — To avoid the use of acid in clearing 

 diatoms a correspondent of a country publication says, put it in 

 ajar of water and shake it for an hour. Evidently the time of 

 this man is of little value and the space of the editor equall}' so. 



NECROLOGY. 



Dr. N. L. Mallory of Rochester, N. Y., died April 28, 1894, 

 from an over dose of chloral. Age 46. He had devoted much 

 time to microscopical and bacteriological investigations, was a 

 member of the American and Royal Microscopical Societies. In 

 1892 and 1893 he was a member of the Rochester Board of 

 Health, and as such worked hard to eradicate tuberculosis. 



