TIIE USE OF ETHYL CHLORIDE WITH GAS OR ETHER. 949that, provided a culture of this cocco-bacillus is of suifficient virulelnce, it is possible to count upon the destructioni by its use of all the rats in a large city without can,ing any daniget whatever to its other inhabitants, lhuman or animal, always supposing that the operations are conducted in an orderly and methodical manner.
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