i9i 7l CUNNINGHAM 



RA 497 



jugation mig ht take place between daughter cells of different 



But if they should so divide that 



mother cells s s \ s s 



the female of one mother cell adjoins the female of another, 

 should have this occurrence | a [ 9 | g |T"| , which is very character- 

 istic of lateral conjugation. Hassall (i6), observing such a 

 phenomenon, stated that in lateral conjugation there were always 

 2 empty cells separated by 2 



West 



73) also figures this condition. Wolle (31) makes a similar 

 statement which, however, is not borne out by his plates, since in 

 several cases he has described as lateral conjugation conditions 



ording to his own figures are manifestly aplanospore 



formations (W 



% I). 



i33> % 1; Pi- x 34, 



This characteristic appearance may be brought about, how- 

 ever, by another method of division. If the cells adjoining 

 should so divide that the male and female elements alternate 



a filament would be produced which upon 

 conjugation would contain 2 zygotes alternating with 2 empty 



If, however, the division should 

 so occur that male adjoined male and female adjoined female 



lZ lT^T^T ^~l- then a further division would produce a filament 



containing 4 consecutive males and 4 consecutive females 



• 



2 2 



Assuming that reduction has been retarded until just previous 

 to reproduction in lateral conjugation, it would be possible for us 



em 



of 2 empty cells and 2 zygotes. If these filaments should cross- 

 conjugate (and there is no reason why they should not), they 



mi 



XXIV 



consecutiv 



would be 2. Assuming further that the second division has 



in the iorm 



* % 1 _^f W * 



tion of sex cells, the greatest number of consecutive zygotes 



would be 4. 



umbers cannot explain the conditions figured on pi. XXV 



and 





