PARAMOECIUM POSSESSING EXTRA VACUOLES 



321 



resenting the vacuole number in the single paramoecia. More 

 of the multi-vacuoled paramoecia conjugate at the end of the 

 epidemic than at the beginning, apparently, not because of 

 different physiological characteristics but because more of these 

 forms appear as the culture ages. 



The period of conjugation was awaited with great interest as 

 furnishing an opportunity for determining the nature of this 



JAN. 22 23 24 25 26 27 28 2» 31 FEB 



14 IS 24 MAR.8 



Chart 12 This graph is reproduced to show the manner in which the various 

 combinations of paramoecia in conjugation follow closely the percentages of 

 two, three and four-vacuoled paramoecia on any day. Note that as conjuga- 

 tion ceases on February 2 the percentage of three and four-vacuoled paramoecia 

 increase. Further discussion is to be found on page 320 under "Effect of 

 Conjugation." 



new character. If the paramoecia were homozygous then we 

 should expect no change in the inheritance of the potentiality 

 for extra organs. But should they be heterozygous, individuals 

 might result which were pure for the lower number of vacuoles. 

 I have used the words 'might result' in the last sentence, since, 

 as far as we know, conjugation between heterozygous paramoecia 

 would present equal possibilities for the offspring of the excon- 

 jugants to be heterozygous as it would for a homozygous line 



