INHERITANCE IN ABNORMALITIES 



393 



TABLE 1 



Diverse types of exconjugants, their number and proportion in the three 

 experimental cultures 



all in Experiment 1. These often live for some time, the length 

 of life varying greatly. The length of life in days for the 101 

 exconjugants that never divided was as follows: 



Length of life in days ". . . 13 5 7 9 11 1.3 15 17 Total 



Number of exconjugants: 



Experiment 1 46 10 4 5 5 3 1 74 



Experiment 2 2 8 4 2 1 10 27 



Total 2 8 50 12 5 15 5 3 1 101 



All of the animals of Experiment 2 which never divided were 

 dead by the thirteenth day after conjugation; in Experiment 1 

 nine such individuals lived for some time after this. Those 

 that live for a number of days often change a great deal in size 

 and shape; many of them become immensely large. Twenty- 

 eight of these individuals were measured; for their lengths and 

 diameters on successive days after conjugation see p. 474. 



The diversities of size and shape among these individuals is 

 illustrated in figure 1, which shows nine of the individuals of 

 Experiment 1 which never divided, all camera lucida drawings 

 to the same scale. The usual size of Paramecium caudatum on 

 the same scale is shown in figure 5. * 



The largest single individual Paramecium that I have ever 

 seen was the first individual listed below for Experiment 1 ; it 

 measured 520 by 150 microns, as against a usual length of 150 to 

 200 microns. The smallest individual that never divided was 

 likewise in Experiment 1; it measured 128 by 10 microns. It is 

 evident that there was much greater variability in size, shape, 



