Osteomalacia is an expression at certain periods of normal in¬ volution. Structures even in embryogeny which are not needed, disappear by involuntary tendencies. Crowded teeth are noto¬ riously products of constitutional tendencies and deficiencies, and hence cannot be affected by the influence of temporary conditions of the tongue. These last conditions are quite fre¬ quently results of constitutional factors underlying conditions of the tongue. The hypothesis of Dr. Wallace, it will be ob¬

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... us, does not comply with scientific requirements; it does not explain all the facts nor does it exclude all other expla¬ nation. The book is one more illustration of the waste of medical research, which results when an incomplete working hypothesis is adopted. A little knowledge of developmental, pathology would have prevented all this waste. Manual on Operative Surgery.