

22 HUMAN SPERMATOGENESIS: A STUDY OF INHERITANCE. 



EXPLANATION OF PLATES I-IV. 



All fi cures have been drawn by the author to the same scale at the level of the base of the mi 

 croscope, with the aid of a camera lucida; Zeiss apochromatic homogeneous immersion 1.5 mm., ocula 



.« A ._t 'i il ica „ m « nn ;fio<>t;nn nf v 3500. All cells neured are from one testis AypH ii 



with the exception of fig 



following 



C.d. f dis 



C°p. f C proximal centriole. <*,' * geminus or bivalent ordinary chromosome. 



d, smaller allosome. 

 dL one-half of the same 



C'.p. 1 , anterior moiety of the same. Ok 



C.p. 2, posterior moiety of the same. Af if., mitochondrial 



D, larger allosome. 



plasmosome 



PLATE I. 



Fio. 1. Strepsinema stage of a giant spermatocyte. 



Figs. 2-6. Strepsinema stages. 



Fias. 7-12. Late prophases of first maturation division. 



Fio. 13. Polar view of chromosomal plate of first maturation division, condition A; the alio- 



iim - ■ mm m % » i t_ 



sion, condition A. Fig. 14 shows all 12 chro- 



somes at a different level from the other chromosomes. 



Fig. 14-17. Lateral views of first maturation div 



mosomes* 



Fio. 18. First maturation division, condition B. 

 Figs. 19-22. First maturation division, conditioi 

 Fig. 23. First maturation division, condition D. 



chromosomes 



Figs. 24, 25. Oblique lateral views of first maturation division, condition E. 



PLATE II. 



Fig. 26. First maturation division, condition F. 



Fig. 27. First maturation division, the left hand 

 conditions E+G. 



Fig. 28. Anaphase of first maturation division. 



shows conditions A+G, the right hand 



29-31. Telophases of first maturation division. 



Figs. 32, 33. Secondary 



Fios. 34-36 



maturation division, in each 



are 



w ^ » -^^ w w — » w 



Figs. 37, 38. Polar views of second maturation division, all the chromosomes shown 



shown. 



39-41 



condition a: in fies. 39. 40 all the chromosomes 



Fio. 42. Second maturation division, condition b. 



Fio. 43. Second maturation division, condition c, all the chromosomes shown. 



Fio. 44.^ Second maturation division, condition d, the chromosomes densely crowd 



Figs. 45, 46. Second maturation division, condition e, both spindles oblique. 



hm. 4/. Second maturation division, condition/. 



Fig. 48. Second maturation division, condition g. 



Fig. 49. Second maturation division, condition h, 1. 



PLATE 



Fig 



50. Second maturation division, condition h, 2. 

 Fig. 51. Second maturation division, condition h, 3. 

 Fio. 52. Second maturation division, condition h, 4. 

 Fig. 53. Anaphase of the second maturation division. 

 t igs. 54, 55. Telophases of second maturation division. 



fti n i !l ,' • Success j ve 8 ^ges in the histogenesis of th< 

 W only the nuclei, centnoles and axial thread are drawn 



Figs. 97-104. 



PLATE IV. 



from 



m°109 114 115 ' Spermatozoa from the vas deferens 

 Fig. 116. 



Ax.F, axial filament; 

 intermediate substan 



from figs. 107, 



t nvtnnlftsm: M 



e of thp \aol~ M-* -1 r , . r > ^P,nem (caput); Vyt, cytoplasm; **.* 

 neck- Pa SJiri ' ™ tocho »dria; Nd.A, anterior nodulus of neck; Nd 



i of head- P Pr ^ F P ° rt , 10n £ head ' PC > i uncti< >n piece (pars conjunction 

 i of nead, P.Pr, principal portion of the tail; P. 7. terminal filament. 



