Diseases of the Skin. 245 
The principles of Zveatment laid down for sarcoptic- 
mange must be rigidly adopted in this disease. Frequent 
and thorough dressing must be persisted in, especial at- 
tention being directed to removal of the crusts in order 
that the dressings may reach the parasites within the hair 
follicles. Suitable formule will be found in Chapter VIII. 
under the head of Parasiticides. As in sarcoptic mange 
the removal of hair by close clipping, or even shaving, 
must be carried out efficiently and without hesitation 
when desirable. The advice concerning removal of the 
crusts given under sarcoptic mange is especially needed, 
frequent baths and subsequent dressings, probably con- 
-tinued for months, being needed before any improvement 
is evident. As we have already remarked, the parasites, 
by reason of their location, are extremely difficult to attack, 
and even, if we are successful, yet another problem awaits 
us, viz., the ova, which may be hiding away on such parts 
as have been restored by destruction of the parents. Care 
must be exercised also with regard to lodging and beds. 
Kennels require cleansing, and nothing answers so effec- 
tually as strong and bviling-hot solutions of caustic potash 
or soda, which should be used liberally by means of a 
large painter’s brush. The best bed is pine shavings, 
frequently renewed ; when they are not accessible, clean 
hay or straw may be used, which should be regularly 
dressed with water containing one-twentiéth part of crude 
“ Sanitas,”and allowed to dry before being put into use. 
‘Beds of whatever kind, having served their purpose, should 
be summarily burned. 
The Harvest Bug, or Leptus autumnalis, the larval 
hexapod of the Zetranychus autumnalis, proves a trouble- 
some parasite to the human subject, giving rise to 
painful boils. It also attacks animals, especially dogs, 
during the hot months of July and August, afterwards 
passing through other developmental changes, and is lost 
sight of. When it reaches the skin it may be detected 
by its bright red colour, and if not speedily removed it 
shortly burrows in the skin, giving rise to irritation. 
When the parts are rubbed the parasite ejects an acrid 
secretion, which, with the burrowing operations, produces 
