A valued correspondent sends us an account of a nectarine produced from a peach tree on the grounds of Mr. E. Wilkins, of Maryland. It is thought to be a case of "reversion." But the first nectarine that was ever known was raised in that manner - not by reversion, but by a sport from a peach. What is called " reversion " by animal physiologists is generally of the same character. Nature is prolific in her powers of varying form, and the resemblance to predecessors is but an incident in the progress, and with little or no regard to that which has gone before. It is, in fact, just such illustrations as this of the relationship of the peach to the nectarine which proves how untenable much of this reversionary theory is.