The many different types and variations of deformities of limbs in animals and man are usually described and grouped from the morphological or genetical point of view. A very few biological experiments have been done for the purpose of elucidating the causes which produce special types of deformities in the embryo.

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The case represents an experimentally produced phocomelias and it can be compared with a case of phocomehas in a human newborn (Pl. 5) showmg an abnormal shortness of the parts of the upper limb at which small finger-like processes are attached.

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