Conservation by sanitation; air and water supply, disposal of waste, including a laboratory guide for sanitary engineers . l code of disinterested service to all haskept the ideals of medicine much more in touch with progress. Preventive medicine was an admirable watchword, publichealth doctor an expressive title. Nevertheless the professionhas been hampered by tradition, bound by authority, and notwholly free to branch out into new fields. But to-day researchin the lines of preventive medicine, the use of all scientificresources to find the reasons why, is absorbing the energies ofthe medical


Conservation by sanitation; air and water supply, disposal of waste, including a laboratory guide for sanitary engineers . l code of disinterested service to all haskept the ideals of medicine much more in touch with progress. Preventive medicine was an admirable watchword, publichealth doctor an expressive title. Nevertheless the professionhas been hampered by tradition, bound by authority, and notwholly free to branch out into new fields. But to-day researchin the lines of preventive medicine, the use of all scientificresources to find the reasons why, is absorbing the energies ofthe medical profession. All honor to it. There is, however, another element in the successful controland application of the knowledge thus gained, in the determin-ing efficiency of health measures. The mechanical basis of modern life must come to the aidof moral and personal influence. It is not enough to tell men todo the right thing; they must be fenced in from the wrong thing. For all these reasons it would seem that the civic or public-service engineer is the emerging leader in community welfare. PART IILABORATORY NOTES 223. Convenient Hygrodeik for Inspection orHumidity at Regular Intervals


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