[115]

(Dec. 25.— 45)

11.

Family Genus & species cease to have meaning, when we collect every species wh. has lived only individuals left. But even if all were collected the whole series wd not be a net, but Genera families &c would not be a net be branches in trees, with their extremities not united. At any one epoch genera & species obviously exist; genera from extinction of that is from only certain of old species having sent down descendants, & species exist are real, partly from same cause & partly because the greater number of species at no one time are varying. Nor will the & Nor will the greater number will become extinct, without ever transmitting descendants to a future epoch—

Species are real, in the same sense as races of our domestic animals are; & man easily distinct from each other,— & are often generally separated by barrier of infertility.— There is no definition to know a race from a variety, nor none to know species—

Keep W