Professor Hertwig, of Berlin, has given a graphic sketch of these insects (
Veterinarian
, vol. xi. pp. 373, 489).
Mr. Holthouse states that,
"placed on the skin of a healthy individual, they excite a disease in the part to which they were confined, having all the characters of scabies; that insects taken from mangy sheep, horses, and dogs, and transplanted to healthy individuals of the same species, produce in them a disease analogous to that in the animals from which they were taken; and that there are too many well-attested cases on record to permit us to doubt of scabies having been communicated from animals to man.
may in some degree be considered as an hereditary disease. A mangy dog is liable to produce mangy puppies, and the progeny of a mangy bitch will certainly become affected sooner or later. In many cases a propensity to the disease will be speedily produced. If the puppies are numerous, and confined in close situations, the effluvia of their transpiration and fæcal discharges will often be productive of mange very difficult to be removed. Close confinement, salted food, and little exercise, are frequent causes of mange.
The [Scabby] Mange
is a frequent form which this disease assumes. It assumes a pustular and scabby form in the red mange, particularly in white-haired dogs, when there is much and painful inflammation. A peculiar eruption, termed
surfeit