It can bred into strains where has never before occurred, and can drawn out in extracted strains which carry cancer into every line with which they are hybridized and these hybrid offspring strains where cancer has been bred in will carry cancer again into every strain with which they are hybridized or can bred out a strain which originally carried cancer. It has been shown in previous communications that the resistance heteroplastic tissue giafts apparently purchase custom research paper depends the activity the lymphocyte. The facts iddch this conclusion based are briefly as foUows The chick help research paper embryo, which normally lacks the ability destroy a heteroplastic tissue graft, if supplied with a bit adult lymphoid tissue, becomes as resistant as the adult in this respect.
Furthermore, an adult animal deprived the major portion its lymphoid system repeated small doses X-ray, no longer has the i ower destroy a graft foreign tissue and this tissue will grow actively. The chief characteristic a failing heteroplastic graft in the unsuitable host a marked local acounulation lymphocytes.
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This foimd in the actively immunized animals as well as in those possessing a natural immunity, but totally lacking in animals susceptible the cancer graft. If the anphoid crisis prevented in Immunized animals a previous destruction the lymphoid elements with X-ray the potentially immime animal changed a susceptible one. We have noted that while repeated exposures X-ray will destroy the lymphoid elements an animal, one small dose will stimulate these same cells. With this artificial method producing a lymphocytosis have attempted study the relation this condition the resistance mice their own spontaneous tumors. For evident reasons was necessary rule essay editing checklist out the complicated question the direct effect X-ray the cancer.
In order this have removed the cancer at operation and with the cancer out the animal has been subjected a stimulating dose X-ray. Immediately after this a graft the original tumor was replaced in the groin the animal. As a control the same procedure was carried out, but with X-ray treatment omitted. As a further check these results cancers spontaneous origin were removed from a number animals and in this set the cancers were exposed direct the same amount X-ray as the animals in the first group had received. After this a graft the tumor was returned the original host. The results these three experiments are judged two criteria Fiist, whether or not there a return the essay writing service legal disease, either at the site removal the cancer, at the point inoculation the returned graft and, second, the time at which the returned graft starts in active growth, if at aU.
The figures these points are given Series I was composed animals with spontaneous cancer treated X while the cancer was outside the body, with later a return a graft the tumor. Series II was made control animals in which the cancer was removed and a graft returned without treatment either animal or tumor. Series III was made animals from whom online law school essay writing service english writing help the cancer was removed and the cancer subjected directly the same amount X-ray as the animals received in the first series, and later a graft this X-rayed cancer returned its original host. It will seen from these figures that i need help writing an argumentative essay an X-ray dose which produced a lymphocytosis when administered directly the animal was sufficient render cent the mice treated immime returned graft their own tumor and in the other per cent greatly retard best mba essay writing service the return the disease. A similar dose X-ray given directly term paper writing services reviews the cancer outside the body did not influence the subsequent growth a graft this tumor when returned its original host. The contrast between these figures buy argumentative essay and those the control series striking, as also the number local recurrences in the two series. If this effect obtained with one stimulating dose X-ray probable that a more pronounced result might obtained a second exposure X-ray It customary divide immunity into two types, natural and acquired, and subdivide the latter into active and passive.
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