No. 587] VARIABILITY AND AMPHIMIXIS 667 



Lateral Conjugation r = .1894 ± .0460 



Scalariform Conjugation r = .0934 ± .0473 



Although in lateral conjugation the value is more than 

 four times the probable error, one is scarcely prepared to 

 state that there is greater correlation between characters 

 in close breeding than in cross breeding on the basis of 

 the data noted above. When considered with the results 

 presented in Table XII, the conclusion seems fully estab- 

 lished, however. 



4. Comparative Size of Zygospores 

 The term "size" as noted in the subsequent discussion 

 is open to various interpretations dependent as to 

 whether length, diameter or volume is being considered, 

 a condition which to some extent complicates the inter- 

 pretation of size characters among multicellular organ- 

 isms which are in general dependent on the number 

 rather than the dimensions of the component cells. 



Those zygospores produced by lateral conjugation 

 (close bred), so far as the present material is concerned, 

 have an average length considerably exceeding those 

 produced by scalariform conjugation (cross bred) while 

 the diameter is approximately the same. This is illus- 

 trated in Table VIII. 



TABLE VIII 



Comparative Length, Diameter and Volume of Zygospores produced 

 by Lateral (Close Bred) and by Scalariform (Cross Bred) 

 Conjugation 



Lateral conjugation 62.380 m. ±.17s 20.600 m. ±.10.5 lis. 733 cub. m. 



Scalariform conjugation 00.440 m. ±.13.-. 2!>.72-> in. ±.0<SO 27.972 cub. m. 



Dl con?ugatio 'n Y ° nn . b +1.940 m. -.070 m. 4-771 cub, m. 



Consequently, here, the average zygospore produced by 

 lateral conjugation has a greater volume than that pro- 

 duced by scalariform conjugation. Utilizing the formula 



