CONDITIONS FOR CONJUGATION 377 



EXPLANATION OF TABLES 



In the tables which follow (1 to 7, inclusive) are recorded the results of experi- 

 ments designed to induce conjugation in the various races of Paramecium (aurelia 

 and caudatum). The tables indicate how long each culture was subjected to 

 dormancy, when renewed, and the nature of the culture medium. Distilled water 

 (and hay infusion) was used except as otherwise noted. The concentrations of 

 'salt cultures' are expressed as final concentrations for the salts in question. 



Conjugation is expressed, when absent as 'none;' when present, in terms of 

 the percentage involved (approximate). 'Casual' conjugation is about 1 per 

 cent or less, or an indefinite small number. 



Unless otherwise stated, the experiments with salts (and other reagents), 

 given in the last column of some of the tables, were conducted, using one part 

 of culture containing numerous paramecia and three parts of the reagent. 



