1364 



Journal of Applied Microscopy 



The spermatozoa of the mouse (Fig. 6) presented many features in striking 

 contrast with other members of this series. The head stained deeply and pre- 

 sented a sUghtly curved spine at one extremity, while surrounding the head was 

 a clear zone (apparent capsule). From the portion of this capsule correspond- 

 ing to the larger extremity of the head, a delicate, faintly stained tail was seen 

 to emerge. This tail was rendered more distinct by the application of heat 

 while staining. Measurements of these cells were found to be as follows : 



Total length, . . 0.12 to 0.158 mm., or 0.0046 to 0.0061 in. 



Length, head, . . . 0.008 to 0.009 mm., or 0.0003 to 0.0003 in. 



Width, head, . . 0.0O3 to 0.004 mm., or O.OOOl to 0.0001 in. 



Length, tail, . . . 0.112 to 0.138 mm., or 0.0043 to 0.0057 in. 



Fig. 7. — Sheep. 



Fig. 8.— Cat, 



The spermatozoa of the sheep (Fig. 7) stained evenly throughout except for a 

 small central portion at the union of the head and tail. Its measurements were 

 found to be : 



Total length, .... 0.083 mm., or 0.0032 in. 



Length, head, . . . 0.009 mm., or 0.0003 in. 



Width, head, .... 0.006 mm., or 0.0002 in. 



Length, tail, .... 0.074 mm., or 0.0028 in. 



Spermatic fluid from the cat (Fig. 8) was found difficult to study, as but few 

 spermatozoa were present. Each spermatozoon presented a tibrillated tail, and 

 at times this fibrillation was seen to surround the head. The head stained 

 deeply, and at times a centrosome was distinct. Decided irregularity was noted 

 in the size and form of the heads, which partially explains the variations found 

 in the measurements of these cells. 



Total length, . . 0.058 to 0.074 mm., or 0.0022 to 0.002s in. 



Length, head, . . . 0.004 to 0.007 mm., or 0.001 to 0.0002 in. 



Width, head, . . 0.003 to 0.003 mm., or 0.0001 to O.OOOl in. 



Length, tail, . . . 0.053 to 0.066 mm., or 0.002 to 0.0025 in. 



