294 



E. C. FAUST. 



The " giant spermatozoa ' ' from the author's preparations had no 

 definite range of variability but blended into the upper reaches of 

 the curve for the normal spermatozoa. The most extreme " giant 

 forms," as well as those that are less extreme, might be considered 

 as wide variants in the frequency distribution of normal forms. 

 If the average normal length is taken, and a "giant spermato- 

 zoon" of twice that chromatic volume is computed, then such a 

 form would still fall within the upper reaches of the normal 

 frequency distribution. It is evident, then, that such forms 



Frequency. 



Length in M. 22.68 23.76 24.84 25.92 27.00 28.08 29.16 30.24 31-32 32.40 33-48 34-56 35-64 36.72 



FIG. 7. Bimodal curve of variability of chromatic-rod length for 2r and 2! 

 combined. Number of spermatozoa around both modes approximately equal. 

 Almost bilaterally symmetrical. 



can be considered as "giant spermatozoa" only when an arbitrary 

 upper limit is placed to the normal frequency curve and these 

 wide deviants considered as twice the volume of average sper- 

 matozoa. 



(3) Error Due to Incorrect Measurement. It is evident that, 

 for the purpose of'measurement, the inner chromatic rod must be 

 well differentiated both anteriorly and posteriorly. Aceto- 

 carmine preparation failed in this respect, while the Delafield's 



