EFFECT OF CONJUGATION 



319 



figure 2, a diagram, which shows the relations of the various 

 parts of the experiment. If the reader will make frequent refer- 

 ences to this, he will have no difficulty in following the account 

 of the experiments, and appreciating their bearings. 



We have, derived from the branch A of figure 1, at first two 

 divisions, designated D and E in figure 2; D has been cultivated 

 continuously on shdes, since March 4, while E was transferred 

 on May 15 from the slides to a watch glass. 



I " 



Jul. 16-28 



Fig. 2. Diagram showing the history and the nature of the comparisons made 

 in the various divisions of Experiment 11, and in Experiment 12. Each rectangle 

 represents one of the parts of Experiment 11, save the one to the right, which 

 represents Experiment 12. The lower case letters a to g, within the rectangles, 

 show the letters under which the various parts of Experiment 11 are described in 

 the text; thus the one marked e shows Experiment lie. The capital letters A to K 

 show the diverse branches of the race k, described in the text. The duration of the 

 experiments is given by the dates below or above each rectangle. The legends at 

 the branches D, E, etc., show the manner of cultivation; the branches D and E 

 being separated on May 15, the former placed on slides, the latter in watch-glasses, 

 etc. 



Now, on June 3, this branch E is divided into four parts, which 

 we may call F, G, H and K. The first two are kept on shdes; 

 the second two in watch glasses. The lots F and H are non- 

 conjugants, while G and K are conjugating pairs kept under the 

 same conditions. Comparison of F and G we may call Experi- 

 ment 11a; comparison of H and K, Experiment 11 b. 



