132 
the pueneby of ii humpur depends upon a repeated invasion 
of the tissue by lar 
Poe of et have been obtained from lesions, and in 
the better preserved specimens the characteristic spinous tip 
at the caudal extremity has been observed. It appears, there- 
fore, that the tumour is a habronemic granuloma. 
DISCUSSION. 
It is remarkable that such a large percentage of horses 
becomes affected. As far as is known to the present writer 
there is no previous record of animals emu affected to 
anything approaching the extent of 75 per c 
Another point of interest is the fact that. hee occur in 
animals that are not at any time confined to the stable. This 
is contrary to the usual experience. The animals, however, 
are not at any time far distant from habitations, so that one 
would = to find Musca domestica in numbers in their 
surroundin 
The fact that the tumours occur only in the one situation 
is of extreme interest. It is not possible, at presen nt, to 
A 
e occurrence of lesions in one situation only does not 
suggest nd biting flies are in any way responsible. 
The larvae bear the came characteristics as those found in 
PIT qe and elsewhere. 
3. “Leeches” and  Bursattee." 
_ “Leeches.”—In North America there exists a co 
tous umen of oe commonly known as ‘‘leeches. 
cording to many writers the lesions are to be found on 
the ets and ces parts of the body which are liable to come 
in contact with water when animals are poer war in s swamps 
OMS dene to be no doubt that the older uer 
ver Ern in as t is condition as a malignant neoplasm 
