The form of the whole creature, as it appear’d in the _Microscope_, may, without troubling you with more descriptions, be plainly enough perceiv’d by the _Scheme_, the hinder part or belly consisting of eight several jointed parts, namely, ABCDEFGH, of the first _Figure_, from the midst of each of which, on either side issued out three or four small brisles or hairs, I, I, I, I, I, the tail was divided into two parts of very differing make; one of them, namely, K, having many tufts of hair or brisles, which seem’d to serve both for the finns and tail, for the Oars and Ruder of this little creature, wherewith it was able, by frisking and bending its body nimbly to and fro, to move himself any whither, and to skull and steer himself as he pleas’d, the other part, L, seem’d to be, as ’twere, the ninth division of his belly, and had many single brisles on either side. From the end V, of which, through the whole belly, there was a kind of Gut of a darker colour, MMM, wherein, by certain _Peristaltick_ motions there was a kind of black substance mov’d upwards and downwards through it from the orbicular part of it, N, (which seem’d the _Ventricle_, or stomach) to the tail V, and so back again, which _peristaltick_ motion I have observ’d also in a Louse, a Gnat, and several other kinds of transparent body’d Flies. The _Thorax_ or chest of this creature OOOO, was thick and short, and pretty transparent, for through it I could see the white heart (which is the colour also of the bloud in these, and most other Insects) to beat, and several other kind of motions. It was bestuck and adorn’d up and down with several tufts of brisles, such as are pointed out by P, P, P, P, the head Q was likewise bestuck with several of those tufts, SSS; it was broad and short, had two black eyes, TT, which I could not perceive at all pearl’d, as they afterwards appear’d, and two small horns, RR, such as I formerly describ’d.