TRICHINAE. 
445 
the podophyllous tissues from the coronary band down to the sole, 
care being taken to avoid the tearing of the structure of the 
coronary band, and the diseased tissues are then removed. If 
the podophyllous tissue, it is excised with the sage knife ; if the 
bone is carious, it is scraped with the drawing knife. The whole 
is then dressed up with a shoe having the toe thinned down, and 
extending somewhat beyond the border of the foot. 
The cicatrization does not take place from the coronary band 
alone, but also from the horny secretions of the podophyllous 
tissues. The repair is then quite rapid. The first dressing is 
removed after eight or ten days, and if everything goes on well 
need not be changed more than once a week. 
The animal is not to be put to work until the hoof has obtained 
a certain consistency. 
The operation for quarter crack is similar, except that only 
one groove is required in front of the crack, the tissues being 
exposed as in the operation for the removal of the lateral carti¬ 
lages of the foot. 
{To be continued.') 
TRICHINA, 
fe A LECTURE DELIVERED BEFORE THE STUDENTS OF THE 
AMERICAN VETERINARY COLLEGE. 
By F. S. Billings, V. M. 
(Continued from page 396 .) 
In order to offer even a very condensed sketch of the evolution 
which these parasites undergo, it is better to begin with the non- 
matured or muscle form. 
The parasite, in this form, limits its abode entirely to the stri¬ 
ated, or motary muscles of the autositic organism. They have not 
been met witli in tiie non-striated muscles or in the purely adipose 
tissue. 
This seems to be the universally accepted opinion, and is in 
general strictly true. Nevertheless, in the investigations which 
we have ourselves recently made, we have frequently found the 
