46 



ROBERT RIKMENSPOEL 



Fig. 

 and by 



0.5 



0.0 



1.0 2.0 3.0 



CONCENTRATION, PHOTOGRAPHIC 



(xio 6 /mi.) 



13. Concentration of semen samples measured with the analyzer 

 photographs, respectively. 



13 for v and c, respectively. The accuracy obtained for v is 6 to 7%, 

 which agrees well with the scattering in p; c can be measured with an 

 error of about 15%. This is larger than the error to be expected from 

 statistics; in this respect the apparatus is inferior to the visual analysis 

 of recorded signals as described above. For almost all other purposes, 

 however, the accuracy of the electronic analyzer is adequate, and the 

 time saved from the tedious work of visual analysis of recorded sig- 

 nals is considerable. 



Some Measurements of Sperm Motility 



With the apparatus described in the previous section the behavior 

 of diluted bull semen was determined under various conditions. The 

 main purpose of these experiments was to gain an understanding of 

 the strictness of control of experimental circumstances required for 

 motility measurements. The conditions of measurement were the 

 same as mentioned above unless otherwise noted. 



Natural Variation of v. The mean velocity of twenty-four ejaculates 

 of four bulls was measured under standard conditions (Fig. 14). 

 The average value of v is 97 ±6 (standard deviation) microns/sec. 



