116 Annual Report for 1893 from the Principal of the 
brief note has already appeared in the Journal (1893, Part IV. 
p. clxxxii.). All the animals of the herd, twenty-three in number, 
were injected with tuberculin, and during the course of the next 
sixteen hours the temperature in all save one had risen to 104° 
Fahr., or over (normal temperature about 101°), and in the exception 
it reached 103§°. According to previous experience with tuberculin 
this indicated that every animal in the herd, with the doubtful 
exception of the one whose temperature barely reached 104°, was 
affected with tuberculosis ; and when an opinion to this effect was 
communicated to Earl Spencer, he decided that the whole herd 
should be slaughtered and submitted to careful post-mortem exami- 
nation. The result afforded striking evidence of the correctness of 
the indications given by tuberculin, for tuberculous lesions were 
found in each of the twenty-three animals. 
In one respect this test was not so conclusive as it might have 
been in other circumstances, for it is obvious that anyone might 
raise the objection that had the herd contained a healthy animal 
that would probably have reacted also. But this objection is to a 
large extent met by the following experiment. There happened to 
be at the College in the month of October last a heifer which, on 
account of extreme emaciation without apparent cause, was 
strongly suspected of being tuberculous ; and a young cow in very 
good condition and supposed to be healthy. Both of these animals 
were injected with the same sample of tuberculin that was 
employed to test the Jersey herd, with the result that the con- 
sumptive-looking heifer did not react (highest temperature 102’8°), 
while the healthy-looking cow did react (highest temperature 105 , 6°). 
These two animals were afterwards killed, and the post-mortem 
showed that the healthy-looking cow had rather extensive tuber- 
culous disease in the lung and the mediastinal gland, while a search- 
ing examination failed to discover any trace of tuberculosis in the 
lean heifer. 
The publication of these facts has already induced several 
veterinary surgeons to use tuberculin in their practice, and it is to 
be hoped that its employment will soon become general. It is now 
generally recognised that tuberculosis is slowly but certainly con- 
tagious when diseased and healthy cattle are housed together, and 
the main obstacle hitherto encountered in attempts to eradicate the 
disease from infected herds has been the impossibility of detecting 
it in its early stages. It deserves the widest publicity among 
owners of stock that this obstacle has been removed by the dis- 
covery of tuberculin. In pedigree stocks especially, tuberculin 
ought to prove of great value, for by its means the disease may be 
eradicated from herds in which it has already obtained a footing (at 
the cost of slaughtering the animals already affected), and, in the 
case of healthy stocks, higher prices could probably be obtained if 
the animals were sold with a guarantee that they were free from 
tuberculosis as indicated by the tuberculin test. 
Tiiberculosis in Horses . — Most British veterinary authors describe 
the equine species as almost insusceptible to tuberculosis ; but 
