Page:Popular Science Monthly Volume 84.djvu/139

Rh In these experiments the seeds were all carefully examined to make sure that they were perfectly developed and differed only in size. The biometric constants of 28 series which developed into mature plants have been compared with those for the original series of seeds from which the plantings were drawn.

 All differences are reduced to a percentage basis.

The results of these studies can be most conveniently presented graphically. To demonstrate more clearly to the eye the existence of a