TUMORS ENCOUNTERED IN VETERINARY PRACTICE. 
591 
ing tissues are not involved, if there is no swelling of the lymph 
glands or if the part affected can be completely amputated with¬ 
out interfering with the tumor tissue, the prognosis of malignant 
tumors is favorable enough to warrant operation. 
In our experience treatment of two carcinomas of the eye 
and one of the penis of the horse have resulted in complete re¬ 
covery. In these cases total extirpation and amputation were 
practised. Treatment of a like number of carcinomas in the same 
regions resulted in rendering the animals useful for a year or 
more when in one case metastasis resulted without the original 
tumor recurring, while in the other two the tumor recurred, ac¬ 
companied by metastasis and involvement of surrounding tissue 
when further operation became impossible, but even in these 
cases we considered the first operation justifiable as an otherwise 
useless animal was rendered useful for from one to three years. 
Tumors involving some structure of eye, or in the nasal passages 
or sinuses, are the most difficult to operate upon. For opera¬ 
tions about the eye where extirpation of the eye itself was not 
necessary, we have found a small, sharp, hooked instrument very 
valuable. Guided by the finger, this can be carried to parts which 
cannot be exposed. Operating just clear of the tumor tissue it 
can be taken away entirely. Operations upon the nasal passages 
or sinuses should be preceded by tracheotomy, then the cavities 
should be liberally trephined, giving plenty of room for a thor¬ 
ough rapid operation upon the tumor. Following operation upon 
skin surfaces the actual cautery may be used to destroy any re¬ 
maining particles of tumor tissue and to produce an eschar under 
which the tissues heal. Operative areas in mucous membranes 
may be penciled with silver nitrate or irrigated with a solution of 
silver nitrate 1-200. 
“ Biological Products (Veterinary)^ is the title of an 
excellent article by Dr. Robert H. Wilson of the Research Labo¬ 
ratory of Parke, Davis & Co., Detroit, Mich., which will appear 
in our September number. 
