Further observations on the relative size and form of the right and left testes of pigeons in health and disease and as influenced by hybridity

This difference in form is perhaps not without interest sine2 the only persistent gonad in the female-that of the left side-is charac- teristically 'thin' and 'long.'The testis tliat develops on this side is similarly characterized as compared with its mate of the right side.6 The number of pairs of testes recorded as of 'equal size' is necessarily larger in those series (diseased and young) in which very small glands predominate.Weighings were usually made to milligrams only, and differences in the two gonads were recorded only in cases where the difference was beyond question.7 The largest follicles t h a t (:an be found in the ovaries of doves (of most species) dead of vcry advanced tuberculosis are rarely more than 1.5 mm. in diameter; the number of smaller but plainly visible follicles in such ovaries is, however, usually quitc large.