26 The MtcROscoPE. 



ing, if taken from a small animal. If a larger animal is chosen the 

 nerve trunk must be cut further do"<vn where it is smaller. Place the 

 cut piece for 10 days in Mueller's fluid, wash, and place in alcohol; 

 cut the sections, place in a 1 per ct. solution of osmic acid with dis- 

 tilled water, then place in a solution of picro carmine and let them 

 remain until colored. If a whole nerve is used, put in a test tube, 

 cover with picro-carmine and let it remain two weeks. — Note Book 

 of American Micro. Post. Club. 



ABSTRACTS. 



Detection of Micko-Organisms. — Since Koch devised his now 

 well-known method of cultivating micro-organisms on plates coated 

 with gelatine, great advances have been made in bacteriological 

 research. Especially is this true of that branch which deals with 

 bacteria in drinking-water. Dr. Frankland has found that, in the 

 storage and filtration to which London water is subjected, the num- 

 ber of mici'o-organisms is reduced ninety-five per cent. Dr. Bolton 

 has shown that the spores of anthrax remain alive in distilled water 

 for ninety days, and in polluted well-water for a year, while the 

 bacilli themselves are very short-lived. The comma bacillus of 

 Koch, as is known, will reproduce itself in water. The importance 

 of these observations is evident when it is considered that, regarding 

 the germ theory as true, zymotic diseases may be spread by means 

 of water impregnated with their germs. — Science. 



The Pathological Histology of Compensatory Hypertrophy 

 OF the Kidney. — Lorentz has made direct micrometric meas- 

 urements of the histological elements of the kidneys in seven 

 cases of experimentally induced compensatory renal hypertrophy, 

 with the following results: The hypertrophy consists chiefly in an 

 increase of the cortical substance of the kidney, and, to a much less 

 degree, of that of the parenchyma. The cortical increase is caused 

 in young animals by both hypertrophy and hyperjDlasia (numerical 

 hypertrophy), while in older subjects the increase in size is due to 

 simple hypertrophy of the elements. The convoluted tubules were 

 always enlarged, and the epithelium is thicker and wider than in 

 normal subjects. The relatively slight increase in the size of the 

 parenchyma is conditioned by enlargement of the lumina of the 

 straight tubules without increase in the size of the lining epithe- 

 lium. No hypertrophy of the connective tissue or capillaries was 

 found. — Centralbl. f. d. Klin. Med. 



