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head, and I could never with my utmost application find so much as a dividing Line in it. Some of them, especially from Waters, are dark and cloudy, but they are generally so transparent, that through the Shell I can see the peritalitick motion quite through their whole length, and a constant pulsation of a part, wich I guess is the Heart, but I could never discover any course of Blood in them (nor even in Shrimps themselves which are as large as some thousands of these) tho I have seen it plainly in Creatures a little bigger, viz. the smallest new hatch'd Spyders, and in the Water insect which is describ'd and pictur'd (tho not accurately) by Swammerdam, under the (very improper) name of Pulex aquaticus. B ut this is of the Testacerous kind, of which I have seen a greater variety (and not less curious) than of the Crustatcers; but 'tis too late to call a new Caufe.

July 5, 1703
Dear Sir,
Snce my last, I have farther observ'd the Lens palustris, and am fully satisfy'd of the truth of its first springing from the bottom. I lately took up some on the shallow side of a Pond, and found the ends of the Stalks (most of which were at least 5 inces long, and as thick as a strong Horse-hair) manifestly radicated in the bottom, so that I could not take them up without railing the Mud with them, which also adhered very visibly to them. These Stalks or Roots are of a curious texture, and almost trasparent, and I have seen their outside very prettily cover'd with a regular sort of Net-work. The Draught in the Transact. No 283 is stiff, and ill represents them.

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