The Sterilizing Effect of High Temperature on the Male Germ-Plasm of the Yucca Night Lizard, Xantusia vigilis

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Abstract
The testes of lizards kept in the laboratory showed disintegration, after temps, of 31-38[degree] C. Damage after 38[degree] was so severe that recovery was not anticipated, but at the lower temps. used recovery seemed to occur similar to that following the normal summer testicular collapse. Histological observations of the tubules indicated that thermal susceptibility might be correlated with rapid cell division. The findings are discussed in regard to the general difference in susceptibility of somatic tissues and [male] germ-cells to high temps., and the evolutionary significance of this difference.

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