402 



T. H. MORGAN. 



There were ten cases of failure of lines to meet above as in 

 categories v and vi. No cases below. 



There were twenty-five cases of spirals beginning above or 

 below, and ending on the same side of body — below or above. 

 Amongst these twenty-five cases there were fifteen that began 

 above and ended below, and ten that began below and ended 

 above. If we compare the data of the thirty-two cases with 

 the twenty-five cases we find that we have ninety-nine cases 

 where the split was on the dorsal surface, and twenty-five 

 cases where the split appeared on the ventral surface.^ That 

 is to say, there were nearly four times as many cases of false 

 unions above as below. 



If we arrange the different forms of abnormalities found 

 under the categories given in the preceding section, we find 

 the relative proportion of the abnormalities in the 100 abnor- 

 mal worms to be as follows. In this count no difi'erence is 

 made as to whether an abnormality occurred once or twice on 

 the same worm. It is based on the results of all abnormalities 

 found present. 



Category i, ii . . . . .42 



These numbers were derived from the data given above as follows ; 

 32 (spirals beginning and ending above) .x2^64 



15 ( ,, „ above and ending below) . ^ 15 



10 ( ,, „ below and ending above) . =: 10 



10 (cases where lines failed to meet above) , =: 10 



15 (spirals beginning above and ending below) . 

 10 ( „ „ below and ending above) . 



99 

 = 15 

 = 10 



25 



