642 
PROFS. STALKER AND NILES. 
(9) A large proportion of the cases cannot be recognized 
by clinical examination. 
(10) No test yet discovered, other than that afforded by 
tuberculin, can detect any considerable proportion of cases 
in the living subject, and this test is practically infallible. 
(11) Injections of tuberculin cannot produce tuberculosis, 
nor are the results harmful. 
I he experiments made by the Iowa Experimental Station 
about the tubeiculin test and its reliability, are presented and 
illustrated by a number of tables where the reports of the con¬ 
dition of the cows submitted to the tuberculin test are given, 
and also by several wood cuts, amongst which, through the Sta- 
