40 EXPERIMENTS WITH DROSOPHILA AMPELOPHILA. 



TABLE 37. Mean wing-dimensions at various periods of continued disuse. 



If the experiment had stopped at the end of the thirty-fifth generation 

 it would have appeared from this table that the wings were actually 

 getting smaller, since the area, as judged by length X breadth, was 

 smaller in the second lot than in the first, and still smaller in the third 

 the difference being nearly ten times the expected error. However, this 

 would have been a hasty conclusion. The fourth lot is as much larger 

 than the first as the third is smaller. So we must conclude that there 

 is no evidence that the constant disuse of the wings during more than 

 40 generations has had any effect. 



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