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We are looking down "Bottle Alley"  (Colon)  before the Americans began ''house-cleaning."    These pools bred the malaria-infected mosquito.

Can you recognize it? This is the same "Bottle Alley" nine months later. It shows what proper draining and paving methods have done.

This dredge is cutting mud out of the  Chagres bottom and pumping it,  through a pipe line, into a mosquito-infested swamp—two good jobs at one operation.