1883.] Physiology. 1195 
THE TUBERCLE-BACILLUS.— In two August numbers of the 
Boston Med. and Surg. Jour., Dr. Ernst gives an extensive résumé 
of the literature pertaining to Koch’s discovery of the bacillus 
tuberculosis. The author has made inoculation experiments upon 
lower animals, and he has made careful histological study of a 
number of human cases of the disease, and concludes that the 
following statements fairly represent the outcome of all investiga- 
tions which have been made upon this subject : 
“1. A staff-shaped micro-organism exists in all forms of the 
os process, and its presence has been demonstrated in 
them 
“tt. It is more abundant in the rapid than in the slow forms of 
the process. 
“tu. Its specific nature as the cause of tuberculosis is claimed 
by Koch on the ground of his observations. 
“Iv. Its specific character has not been successfully refuted by 
trustworthy observations. 
“v, Its value as diagnostic evidence of tuberculosis is very 
great, although its absence cannot be considered as excluding that 
ocess,” 
certain higher tones, viz., that the sound waves that a 
into the cochlea occasion a synchronous vibration either in the 
notes and the lon fi d notes and noises, and 
r ger ones for the deeper ; ; 
are set into synchronous vibration by them. This hypothesis has 
igher animals. After he had succeeded in overcoming ihe 
steat practical difficulties, he wounded the top of the cochlea ol 
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