MORPHOLOGICAL, measurements 1 have shown that the spinal column of the shrew (Sorex) contracts during the winter and lengthens again in the spring. This lengthening is noticeably greater than the ...
IT is now nearly forty years since Dr. Gadow and Miss Abbott published their well-known paper on “The Evolution of the Vertebral Columns” in the Philosophical Transactions of 1895-96, the first ...
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