382 The Miceoscopb. 



ABSTRACTS. 



KoEKUNOFF ON TUBERCULOUS Ulcers. — Korkunoff (Wratsch., No. 

 32, p. 612), having made a number of careful studies as to the 

 origin of tubercular ulcers in the larynx, and the participation of 

 the tubercle bacilli in the process, comes to these conclusions: 



1. Careful search will always show the presence of the bacilli, 

 though their number does not always correspond with the extent of 

 the process. 



2. The infection is never through the sputum, but rather 

 through the lymph and blood channels leading from the affected 

 lung. 



3. The ulcers arise in this way: A small tubercle grows 

 beneath the epithelial layers, from which it may be separated by 

 connective tissue. Its approach to the surface is preceded by an 

 infiltration of the epithelial covering with leucocytes. The bacilli 

 now make their appearance. Necrosis of the epithelium takes 

 place, and the ulcer is thus established from within outwards. 



NEWS AND NOTES. 



" Show me the investigator who has never made a mistake, and 

 I will show you one who has never made a discovery." 



Up to July, 1888, the Army Medical Museum contained 10,416 

 microscopical specimens. 



Dr. Leidy says that the drum-fish seems, in some instances, to 

 owe its flavor to a parasitic worm, Acanthorhynciis rei^tans. 



Dr. a. Julien and Prof. H. C. Bolton have discovered what 

 seems to be the explanation for the phenomenon of singing or 

 sonorous sands. These sands are quite clean, free from silt and 

 and dust. When moistened, and the moisture is evaporated, a film 

 of condensed air is formed on the surface of each grain, which acts 

 as an elastic cushion, and enables the sand to vibrate when 

 disturbed. 



The Rev, W. H. Dallinger, ex-President of the Royal Microscop- 

 ical Society, has resigned the presidency of Wesley College, 

 Shefiield, England, and will devote himself hereafter to research in 

 bacteriology and other lines in which he is so well known. London 

 will be Dr. Dallinger's future home, and he will there fit up a. 

 private laboratory. 



