The Kansas University science bulletin, Vol. I, No. 8, September 1902

by Unknown

Fig. 29. Metaphase of a second spermatocyte, in which the accessory chromosome is not present.

Fig. 30. Anaphase of second spermatocyte, in which there is no accessory chromosome.

Fig. 31. Anaphase of second spermatocyte, where the accessory chromosome is present—x¹ and x².

Fig. 32. Telophase of the same class of second spermatocytes. The accessory chromosome extends out from the mass of chromosomes at each pole—x¹ and x².

Fig. 33. Telophase of the class of second spermatocytes from which the accessory chromosome is absent.

Explanation of Plate IX.

Fig. 34. Photomicrograph of early spireme stage of first spermatocyte, showing peripheral position of the accessory chromosome x. At the left, secondary spermatogonia, last generation. × 1300.

Fig. 35. A late prophase, showing accessory chromosome x, and spindle remains s (cf. figs. 3 and 4). × 1300.

Fig. 36. Coarse spireme of first spermatocyte. × 1300.