. Skull of a Bull-dog. The cranial and dental conditions which are commonh^ found^in different breeds are subject to much variation. Dr. Windle and Mr. John Humphreys, who have gone, with exceeding care, into this question, tell us*:—"The range of variation (as to skull and teeth) in any breed is much greater, in almost every case, than that existing between • Troe. Zool. Soc. 1890, pp. 24 & 26.

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