. The American shepherd : being a history of the sheep, with their breeds, management, and diseases : illustrated with portraits of different breeds, sheep barns, sheds, &c. : with an appendix, embracing upwards of twenty letters from eminent wool-growers and sheep-fatteners of different states, detailing their respective modes of management . Sheep; Sheep. 372 DISEASES OF THE SHEEP. a female it appears with a multitude of young. These im- mediately set to work on the skin, bury themselves and prop- agate until the poor animal is irritated to death, or becomes incrusted with scab. M, Walz
. The American shepherd : being a history of the sheep, with their breeds, management, and diseases : illustrated with portraits of different breeds, sheep barns, sheds, &c. : with an appendix, embracing upwards of twenty letters from eminent wool-growers and sheep-fatteners of different states, detailing their respective modes of management . Sheep; Sheep. 372 DISEASES OF THE SHEEP. a female it appears with a multitude of young. These im- mediately set to work on the skin, bury themselves and prop- agate until the poor animal is irritated to death, or becomes incrusted with scab. M, Walz satisfactorily traced the par- asite through all its changes, and by experiment discovered its mode of action, and method of infection. He found that when the male acari was placed on a sheep it burrowed, the pustule was formed, but the itching and scab soon disappear- ed without the employment of any remedy. Such was not the case where the female acari was placed on the sound skin J as with the breaking of the pustule from eight to fif-' teen little ones made their appearance. M. Walz found that the young acari kept in a dry place, dried and crumbled to dust; but when old, that it would retain its life through the whole winter; thus proving the necessity of not relying on the season for their destruction, but on preparations of active medicine when the disease shows itself. Of the origin of these insects, we of course can know nothing; it is enough that we are certain when they make their appearance they can be met and ;—{Cultivator.) Fig. 2. Fig. 1. Fig. , Fig 1. The insects of their natural size on a daik ground. Fig. 2. The ftmale, of 366 times the natural size, larger than the male, of Mi oval fcnn, and provided with eight feet, four before and four behind. b. b. b. b. The four anterior feet, with their trompet-lilte appendices. c. c. The two Interior hind-feet . d. d. The two outward feet, the extremities of which are provided with some long hairs
Size: 2198px × 1136px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthormorr, bookcentury1800, bookdecade1860, booksubjectsheep
