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H. E. Jordan 
Fig. 14. Polar view of similar stage. 
Fig. 15. Later contraction phase(synizesis; synaptenic nucleus — Winiwaeter). 
Centrosome again discemable. 
Fig. 16. Synapsis (telosynapsis): height of loops about equal to diameter of 
nucleus; pacliytene stage (Winiwarter). 
Fig. 17. Early postsynaptic pliase; the loops appear joinecl to form a continuous 
moniliform spireme with accessory chromosome attached to one end. 
Figs. 18, 19. 20, 21 and 22. Successively later postsynaptic stages ; tlie accessory 
chromosome always clearly distinguishable and frequently attached to one of tlie loops. 
Figs. 23 and 24. Later stages sliowing the nuclear origin of chromidia (mito- 
chondria) and the division of the centrosphere. 
Figs. 25, 26, 27 and 28. Prophase stages; accessory chromosome (oval, compact, 
with sliarp contour) conspicuous among the irregulär mossy deeply-staining ordinary 
cliromosomes (loops, rings, paired rods, etc.); chondriosomes (mitocliondria) scattered 
tliroughout the cytoplasm. 
Plate II. 
Figs. 29. 30. 31, 32 and 33. Metaphase plates of cliromosomes (9) of first matu- 
ration spindles (haploid group). The accessory chromosome is recognizable by its large 
size and bipartite form. Chondriosomes are scattered among the cliromosomes. 
Figs. 34, 35, 36 and 37. Side views of the diploid groups in metakinesis; the 
accessory is seen to pass undivided, and in advance of tlie ordinary chroniosomes, to 
one pole. Tliis is the reduction division. 
Fig. 38. Late anaphase, sliowing the accessory chromosome (X) at one pole 
recognizable among the group of automoses. 
Figs. 39 and 40. Resting secondary spermatocytes, with and without chromatin- 
(chromosome = accessory) nucleolus respectively. Some new chondriosomes appear 
to be formed, while the majority of those present liave been carried over from the 
mother cell. 
Fig. 41. Very early prophase of the second division, the accessory chromosome 
close to the centrosphere (idiozome). 
Figs. 42 and 43. Metaphase plates of cliromosomes (4) of second maturation 
division (hemioid group) showing a second numerical reduction of the chroniosomes. 
Fig. 44. Side view of the metaphase group of 4 chroniosomes and a small mito- 
chondrial mass. 
Fig. 45. Anaphase of similar group. 
Fig. 46. Hemioid group of 5 cliromosomes. 
Fig. 47. Side view of metaphase plate of 5 cliromosomes. 
Fig. 48. Anaphase of similar group and a mitochondrial mass. 
Plate III. 
Figs. 49, 51 and 52. Hemioid groups of 5 cliromosomes, showing the larger acces- 
sory chromosome. 
Fig. 50. Side view of metaphase plate of 5 chroniosomes. 
Fig. 53. Anaphase group of 5 cliromosomes. 
Fig. 54. Anaphase group of 4 cliromosomes. 
F'igs. 55, 56 and 57. Four successively later telophases of second maturation 
mitosis; 55 illustrates an approximately equal division of the mitochondrial substance. 
