When the tree-bug has deposited its eggs in the boughs of the fir-tree, excrescences arise, shaped like pearls. When another insect of the same species has deposited its eggs in the mouse-ear, chick-weed, or speedwell plants, the leaves contract in a wonderful manner into the shape of a head. The water spider excludes eggs either on the extremities of juniper, which from thence forms a lodging that resembles the arrow-headed grass; or on the leaves of the poplar, from whence a red globe is produced. The tree-louse lays its eggs on the leaves of the black poplar, which turn into a kind of inflated bag; and so in many other instances.

Nor is it only upon plants that insects live and lay their eggs. The gnat commits her's to stagnant waters; the flesh-fly, in putrified flesh; another kind of insect deposits her's in the cracks of cheese.

Some insects exclude their eggs on certain animals; the mill-beetle, between the scales of fishes ; a species of the gad-fly, on the back of bullocks; another of the same species, on the back of the rein-deer; another, in the noses of sheep; another still, in the intestinal tube, or the throat of horses. Nay, even insects themselves are generally surrounded with the eggs of other insects; so that there is, perhaps, no animal to be found, but what affords both lodging, and nourishment, and food, to other animals: even man himself, the haughty lord of this lower world, is not exempt from this general law.

We shall next call the reader's attention to some particulars respecting the Formation of Animals.

Whatever matter may be in itself as to its essence, it is certain that it appears to our senses as various and heterogeneous: however, the modus of the formation of animals is still unknown. The inspired writers express themselves here, at least, according to the capacity of the learned, as well as the vulgar, when they acknowledge the ignorance of mankind,- how the bones do at first grow in their embryo state, - and that we are fearfully and wonderfully made, when we are fashioned secretly in the lower parts of the earth. However, it seems not probable, that one part of matter acting upon another, should produce animal existence, though we grant it may have a strange and unaccountable power in the alteration of matter purely insensible or inanimate. Fermentation may dilate, and extremely alter the parts of animated matter, when they are delineated and marked out by the finger of the Almighty; but still, matter being a principle purely passive and irrational, we cannot conceive how it should become an animal, any more than a world, it being much more easy for stones to leap out of a quarry, and make an Escurial, without asking the architect's leave, or calling for the mason, with his mortar and trowel, to assist them.

Nor seems it necessary, or rational, that the first seed of every creature should formally include all those seeds that should be afterwards produced from it; since it is, we think, sufficient that it should potentially include them, just as Abraham did Levi ; or as one kernel does all those indeterminate kernels that may be thence afterwards raised; the first seeds being doubtless of the same nature with those that now exist, after so many thousand years, the order of time making only an accidental difference; which if we do not grant, we must run into this absurdity, that every thing does not produce its like, - a bird a bird, or a horse a horse, - which would be to fill all the world with monsters, which nature does so much abhor.

But every vegetable seed, or kernel, for example, does now actually and formally contain all the seeds or kernels which may be at any time afterwards produced from them. A kernel has indeed, as we have found by microscopes, a pretty fair and distinct delineation of the tree and branches into which it may be afterwards formed by the fermentation of its parts, and addition of suitable matter; as in the tree are potentially contained all the thousands and millions of kernels, and so of trees, that shall or may be thence raised afterwards: and some are apt to believe it must be similar in the first animals ; whereas the finest glasses, which are brought to an almost incredible perfection, cannot discover actual seeds in seeds, or kernels in kernels ; though, if there were any such thing as an actual least atom, they might, one would think, be discovered by them, since they have shown us not only seeds, but even new animals, in many parts of matter where we never suspected them, and even in some of the smallest animals themselves, . whereof our naked sight can take no cognizance. As for the parts of matter, be they how they will, finite or infinite, it makes no great alteration; for, if these parts are not all seminal, we are no nearer. Nay, at best, an absurdity seems to be the consequence of this hypothesis; because, if those parts are infinite, and include all successive generations of animals, it would follow that the number of animals too should be infinite ; and, instead of one, we should have a thousand infinites ; and it would be strange too if they should not, some of them, be greater or less than one another.

For that pleasant fancy, that all the seeds of animals were distinctly created at the beginning of time and things, that they are mingled with all the elements, that we take them in with our food, and the he and she atoms either fly off or stay, as they like their lodgings ; we hope there is no need of being serious to confute it. And we may ask of this, as well as the former hypothesis, - what need of them, when the work may be done without them ? The kernel, as before, contains tho tree, the tree a thousand other fruits, and ten thousand ken nels ; the first animal several others; and as many of then; as Nature can dispose of, and provide fit nourishment for, are produced into what we may call actual being, in comparison to what they before enjoyed. If it be asked, whether these imperfect creatures have all distinct souls while lurking ye* in their parent ? we answer, that there is no need of it; the) are not yet so much as well-defined bodies, but rather Darts of the parent: there is required yet a great deal more of the chemistry and mechanism of nature, and that in both sexes, to make one or more of these embryo beings, the offspring of man, capable of receiving a rational soul; but when that capacity comes, and wherein it consists, perhaps he only knows, who is the Father of spirits, as well as the former of the universe.