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This edition of Dr. Boyd's book is very welcome. The author has evidently revised the first edition with unusual care and thoroughness, since corrections and additions appear with great frequency. A few of these may be noted. Recent work on immunization in scarlet fever and measles is described. The activated sludge process for sewage disposal is given increased consideration, and the section on water supply expanded. The chapters dealing with vitamins and dietary difficiency diseases are materially changed and improved. There is no doubt but that the usefulness of the book has been greatly increased by the revision, on account of the added information that it now contains and the better presentation of the material.
Preventive Medicine. JAMA. 1926;86(3):223. doi:10.1001/jama.1926.02670290063040
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