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Updated: June 19, 2025
These inconceivably minute particles are therefore the germs of the Heteromita; and from the dimensions of these germs it is easily shown that the body formed by conjugation may, at a low estimate, have given exit to thirty thousand of them; a result of a matrimonial process whereby the contracting parties, without a metaphor, "become one flesh," enough to make a Malthusian despair of the future of the Universe.
Dallinger and Drysdale on certain Monads, relate, in part, to a form so similar to my Heteromita lens, that the history of the one may be used to illustrate that of the other.
Numerous forms of such animals have been described by Ehrenberg, Dujardin, H. James Clark, and other writers on the Infusoria. Indeed, in another infusion of hay in which my Heteromita lens occurred, there were innumerable such infusorial animalcules belonging to the well-known species Colpoda cucullus.
It stands in the same relation to Heteromita on the animal side, as Coleochaete does on the plant side. Start from either, and such an insensible series of gradations leads to the monad that it is impossible to say at any stage of the progress where the line between the animal and the plant must be drawn.
At the point which answers to that from which the two cilia arise in Heteromita, there is a conical depression, the mouth; and, in young specimens, a tapering filament, which reminds one of the posterior cilium of Heteromita, projects from this region.
The body becomes rounded and quiescent, or nearly so; and, while in this resting state, divides into two portions, each of which is rapidly converted into an active Heteromita. A still more remarkable phenomenon is that kind of multiplication which is preceded by the union of two monads, by a process which is termed conjugation.
I have been unable to devote to my Heteromita the prolonged study needful to work out its whole history, which would involve weeks, or it may be months, of unremitting attention. But I the less regret this circumstance, as some remarkable observations recently published by Messrs.
I am not aware that the investigators from whom I have borrowed this history have endeavoured to ascertain whether their monads take solid nutriment or not; so that though they help us very much to fill up the blanks in the history of my Heteromita, their observations throw no light on the problem we are trying to solve Is it an animal or is it a plant?
These most patient and painstaking observers, who employed the highest attainable powers of the microscope and, relieving one another, kept watch day and night over the same individual monads, have been enabled to trace out the whole history of their Heteromita; which they found in infusions of the heads of fishes of the Cod tribe.
Dallinger and Drysdale of the existence of a contractile vacuole in this monad, though they describe it in another. Their Heteromita, however, multiplied rapidly by fission.
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