# Page:Popular Science Monthly Volume 62.djvu/280

Suppose now we sow all these nine kinds of seed and secure mature plants from each. Those of the type GB can easily be distinguished by their appearance. It can be selected out at once, as a new variety fixed in character. The case is different with VS, VB and GS. For example, if we attempt to select GS, we get also GSb, which has exactly the same external characters. But if we take all the plants with glabrous chaff and smooth heads (GS ${\displaystyle +}$ GSb) and save the seed of each plant separately, we can separate the next generation by noting which plants reproduce true to type; for the seed of GS will produce GS plants only, while that of GSb will produce one fourth GS, two fourths GSb, and one fourth GB, according to Mendel's law. Or, since GS and GSb appear alike, one fourth of the progeny of GSb will be GB (glabrous and bearded), the remaining three fourths being glabrous and smooth. In the same way we can separate VS from VSb, VgS and VgSb, and VB from VgB.