The notion of recapitulation by a developing embryo has been soundly discredited for years. Indeed, even when it was in favor it was maintained only by ignoring contrary evidence, and even by outright forgery of evidence. But still the notion reappears now and then, chiefly in text-books, or semi-popular writings, the readers of which are not in a good position to learn the truth from other sources. Thus, it seems worth while to point out once more that the notion is a completely false one, and is not held by knowledgeable biologists themselves.