Show protection FROM SNAKES good res aits nits obtained fromm from the vo vao ci eln atlon nation of earge animals animal the task of artificially render ingan emals immune from snake poison is not an easy one tor for the process depends u upon pon training the animals to gradually W withstand larger and larger doses of the venom and considering the intensely toxic character of the substance which had to be handled the th danger was ever present of the animal succumbing to venom poison before its serum had acquired the requisite pitch of protective power to render it of service as an antitoxin anti antl toxin dr calmette tells us says longmans magazine that he carried out a very large number of experiments before he met with success but it is not necessary here to discuss the various efforts suffice it to say that at length his labors were rewarded and the following extract from one of his memoirs describes the methods which he now adopts for the purpose the best method of procedure for the purpose of vaccinating large animals destined to produce anti venomous serum consists in injecting them from the outset with gradually increasing q quantities uan tides of the benom of the cobra mixed with dimin shing quantities of a one to sixty solution of lime the condition and the variations in the weights of the animals axe are carefully followed in order that the injections may be made less frequently if the animals animal a do not thrive well quantities of stronger and stronger venom are in turn injected first considerably diluted and then more concentrated and when the animals have acquired acquire d a sufficient immunity the venom s derived from as large a number of different species of snakes as possible are injected the duration of the treatment is of considerable length at least fifteen months before the serum is sufficiently active to be used for the purpose of treatment during the last three years an immense dunber of animals have been vaccinated vaccina ted by this method at the pasteur institute at lille |