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aconitus acres Agricultural anopheline breeding grounds Bukit Gantang C. N. Maxwell cent Central Health Board close cultivation clover CONTROL OF MALARIA Controller of Labour coumarin death rate diseased District drainage drains Egypt emigration employer engagement book engineer estates evidence fact Factor farming Federated Malay Fenugreek fodder crops Forest Department fuliginosus gardens Government health barrier Health Boards Enactment Health Officers hookworm hospitals Immigration Board immunity Indian Immigration Indian labourer infected irrigation island jungle Klang Krian Kuala Lumpur Labour Code Labour Department Labour Officer Lamborn larvae larvicidal legumes leguminous ludlowi maculatus malaria carriers malarial fever malarial mosquitoes MALAY MAIL Malaya Malays and Chinese manure medical practitioners Melilotus ment miles mosquito curtains Negri Sembilan nitrogen organisation Penang perfect cultivation planters plants ponds population Port Swettenham potentially malarious Principal Medical Officer ravines recruitment reserved forests rice rubber settlement Singapore Sir Malcolm Watson staff swamp tion umbrosus weeds Willcocks