22O C. M. CHILD. 



PLATE XIV. 



FIG. 38. Nuclei and old nucleolus after fragmentation with other stages ad- 

 joining. 



FIG. 39. Probably migration of nuclei to periphery after fragmentation. 



FIG. 40. Possible case of secondary fragmentation. 



FIG. 41. A case of mitosis in a cytophore which was probably formed by frag- 

 mentation. 



FIG. 42. Spermatid nuclei formed by mitosis. 



FIG. 43. Spermatid nuclei. 



FIGS. 44 and 45. Early stages in the development of the spermatozoa. 



FIG. 46. Development of the spermatozoa. 



FIG. 47. A-E, development of the spermatozoa after different methods of fixation 

 and staining ; A, M. expansa, sublimate and Delafield's haematoxylin ; , M. ex- 

 pansa, sublimate and iron-hsematoxylin ; C, M. pianissimo, chrom-oxalic and iron- 

 haematoxylin ; D, M. expansa, Hermann and iron-hsematoxylin ; , M. planissima, 

 sublimate and iron-haematoxylin, extraction stopped at an early stage. 



