...He cannot discover source of noise and thinks it comes from his testicles... 
Fay-Cooper Cole 「Traditions of the Tinguian: A Study in Philippine Folk-Lore」
...The malesperm-cells in the testicles must undergo similar changes in view of the comingimpregnation as the ova in the female ovary...
Ernst Haeckel 「The Evolution of Man」
...In the male the testicles pass out of theventral cavity, and penetrate by the inguinal canal into a sac-shaped fold ofthe outer skin...
Ernst Haeckel 「The Evolution of Man」
...When it remains open the testicles may periodically pass into thescrotum, and withdraw into the ventral cavity again in time of rut (as in manyof the marsupials, rodents, bats, etc...
Ernst Haeckel 「The Evolution of Man」
...The testicles are situated in the cavity of the abdomen, immediately below the kidneys: they are large for the size of the animal...
David Collins 「An Account of the English Colony in New South Wales, Vol. 2」
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