175 
I r 
I parison of results with these different portions of the milking may 
throw light upon the source of infection of the milk, whether from 
feces or from the milk glands. 
i Jaeger. Ueber die Moglichkeit tnberkuloser Infektion des Lymph-systems durch 
I Milch und Milchprodiicte. Hyg. Rundsch, 1899, IX, p. 801. 
j Examined the milk supplied to a large hospital in Konigsberg. 
I The dairy was in good condition and frequently inspected, but the 
cows tvere not tested with tuberculin. 
■ Six guinea pigs were injected with the milk intraperitoneally. 
Two died of sepsis, 2 remained normal, and 2 developed tuberculosis. 
i One hundred specimens were examined by the coverglass method 
for the tubercle bacillus, which was demonstrated in 7 specimens. 
' Kanthack, A. A., and Sladen, E. S. St. B. Influence of the Milk Supply on the 
Spread of Tuberculosis. Lancet, 1899, vol. I, p. 74. 
U Examined the milk supply of the various colleges in Cambridge 
I for the presence of the tubercle bacillus. Milk from 16 dairies was 
examined, 3 specimens from each. Two guinea pigs were injected 
I subcutaneously with each specimen, one from the cream layer and 
j the other from the sediment, after centrifuging 10 cubic centimeters 
, of the milk for minutes; guinea pigs examined after death 
I from disease or killed, the characteristic histological tubercle being 
I deemed necessary for the diagnosis of tuberculosis. Of 33 animals 
ij suspected of being tuberculous 10 were found by microscopical exam- 
'■ ination to be free from the disease, while of 23 having typical histo- 
ii logical tubercular lesions, 16 showed the presence of the bacillus. 
\ Eesults: Of 16 daries examined, 9 furnished tubercular milk. Of 
' 90 guinea pigs inoculated, 23 died from tuberculosis (25.55 per cent). 
It is interesting to note that 13 of these were inoculated with the 
r cream layer, while only 10 received the sediment. 
; Macfadyen, Allan. Lancet, 1899, vol. II, p. 849. 
f 
' In a report of work done at the Jenner Institute for the Hackney 
; vestry, it appears that of 100 specimens submitted for examination 23 
had to be excluded from the results because of the premature death 
of the test animals. Of the remaining 77 specimens, 17, or 22 per 
cent, were found to be infected with virulent tubercle bacilli. The 
milk was centrifuged 30 minutes, the cream removed and the milk 
recentrifuged for 30 minutes. The sediment was then used for inocu- 
lating guinea pigs. 
Ostertag. Zeit. f Fleisch- und Milcbhygiene, IX, No. 12, 1899, p. 221. 
Examined the milk of some 50 cows which had no clinical evidence 
of tuberculosis, but had reacted to tuberculin. Milk received with 
