In some cases (many species of Ascaris) the metamorphosis is reduced to a simple process of growth.
The weight of Malpighi's observations therefore fell into the scale of that doctrine which Harvey terms metamorphosis, in contradistinction to epigenesis.
He thus views the consecration of the elements as akin to other consecrations; and, like priestly ordination, as involving " a metamorphosis for the better," a phrase which later on became classical.
A dragonfly goes through a metamorphosis period just like a butterfly.
Miller discovered that they undergo a metamorphosis, and that the minute worm-like lamperns previously known under the name of Ammocoetes, and abundant in the sand and mud of many streams, were nothing but the undeveloped young of the river-lampreys and small lamperns.
