696 
CORRESPONDENCE. 
body, and composed of 8-9 groups of small acini. Geoital pore 
immediately anterior to acetabulum. Eggs 0.030 long, 0.011 
mm. broad. 
HOSTS. —Cat, dog and glutton ( Gulo borealis ). 
Geographical Distribution. —Germany, Holland, Italy, 
France. 
These three distomes belong io the second section of the 
sub-genus Dicrooelium Duj., characterized as follows : 
Dicroceliinn. —Digestive tract with two long, simple (un¬ 
branched) intestinal caeca; a shorter or longer oesophagus is 
present ; oral sucker without spines or lobes ; acetabulum 
sessile. 
First section.—Testicle posterior to the acetabulum, anterior 
to or among the uterine loops. 
Second section.—Testicles posterior to uterus. 
CORRESPONDENCE. 
TUBERCULIN AS A DIAGNOSTIC AGENT. 
Brooklyn, January 20, 1894. 
Editor American Veterinary Review : 
I take the liberty of sending you a brief sketch of the history 
of the result of tuberculin as a diagnostic agent in an instance 
in which I was recently interested. 
The admirers of high-bred Jersey cattle and scientific dairy¬ 
ing will be sorry to learn that Mr. F. W. Hawley, proprietor of 
the Pittsford Farms of Pittsford, New York, has recently deter¬ 
mined to destroy his entire herd of pedigreed animals, number¬ 
ing over 160, having satisfied himself that they are tainted with 
tuberculosis. Mr. Hawley had his stock in the charge of local 
veterinarians, with instructions to make periodical physical ex¬ 
aminations, report to him the existence of any contagious dis¬ 
ease, and to isolate or slaughter any suspected animals. Desir¬ 
ing to be doubly certain of the healthy condition of his cattle, 
Mr. Hawley some time ago requested the State Board of Health 
that they examine his herd by the tuberculin test. 
Out of the entire herd, 120 cattle, having a normal tempera- 
