. Biology in America. Biology. 462 Biology in America the wall of the intestine, and then migrate, probably through the blood vessels to the muscles. Here they encyst, surround- ing themselves with a capsule which is partly secreted by themselves and partly by the irritated tissue surrounding* them. If now, the improperly cooked flesh of a hog, infected with these trichina is eaten by man or the rat, the sheaths are dissolved by the digestive ferments of the second host and the ^^.^. ,.'"... .v Trichina Imbedded in Muscle Courtrnii o} the U. .V. Bureau of Animal Industry. worms are set fr
. Biology in America. Biology. 462 Biology in America the wall of the intestine, and then migrate, probably through the blood vessels to the muscles. Here they encyst, surround- ing themselves with a capsule which is partly secreted by themselves and partly by the irritated tissue surrounding* them. If now, the improperly cooked flesh of a hog, infected with these trichina is eaten by man or the rat, the sheaths are dissolved by the digestive ferments of the second host and the ^^.^. ,.'"... .v Trichina Imbedded in Muscle Courtrnii o} the U. .V. Bureau of Animal Industry. worms are set free in its intestine to repeat the cycle occurring in the hog. It is during the course of their migration and en- cystment in the muscles that occurs the terrible suffering caused by this disease which is usually relieved by death alone. If however the infection be light, the patient may recover, the worms finally dying, and being absorbed, leaving only the connective tissue scars to mark their place. Since hogs rarely have the opportunity of eating human flesh the rat becomes in one sense a necessary agent in the persistence. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
Size: 1601px × 1561px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcontributor, bookpublisherbostonrgbadger, booksubjectbiology
