VOL. IX.] PHILOSOPHICAL TRANSACTIONS. I'lQ 



round place, which I take to be filled with air. This large room being, Jis to 

 its fore part, filled about half full with blood, then propels its blood backward, 

 and the air forward again ; and this is continued with great quickness, while the 

 louse is drawing the blood ; except that at times she stops a little, as if she were 

 tired, and recollects herself; a motion like that, it seems, which is in the mouth 

 of a sucking infant : from thence the blood passes in a fine stream into the 

 midst of her head, that being also a large round place, where it has the same 

 motion. Hence it passes in a subtile stream to the breast, and thence into a 

 gut, which goes to the hindmost part of the body, and with a curvity bends a 

 little upwards again. In the breast and gut the blood is without intermission 

 moved with great force, and especially in the gut, and that with such strong 

 beatings downwards, and with such a retrocourse and contraction of the gut, 

 that a curious eye cannot but admire that motion. In the upper part of the 

 crooked ascending gut, which is very straight, now and then a little blood 

 crowds through, which returns not back, and here I presume is a little valve : 

 the blood, that is thrust through here, stands still, and soon receives another 

 nature, becoming of a watery colour ; and in this watery liquor there appear 

 some blackish sandy particles, having a confused motion, which grow in size, 

 and being grown as large as sand is to our eye, the said particles join themselves 

 close and firm together, as it were in one mass, and then shoot down to the 

 anus, carrying with them, in case the louse have much blood in her body, a 

 little aqueous blood. These excreted particles appear like the excrement of a 

 silk-worm. 



Sir Samuel Mor eland's Undertaking Jbr raising fVater. N° 102, p. 15, 



The common and received opinion throughout Europe, has been, that if a 

 given weight will force up water 20 feet high, there must be more than twice 

 that weight to force it up 40 feet, and more than thrice that weight to force it 

 up 6o feet, and so by a geometrical proportion in infinitum. And also, that a 

 barrel of a pump, 6 inches wide, does not require a pipe, through which the 

 water must be drawn up, above li inch, or 2 inches, at the most, in diameter. 



Sir Samuel Moreland undertakes to demonstrate, 1. That he will force water 

 6o feet high with treble the weight that shall raise it 20 feet, and so propor- 

 tionably in infinitum. — 2. That by how much wider the barrel is, in which the 

 forcer works, than the pipe through which the water is forced up, by so much 

 is the engine pressed with unnecessary weight. 



VOL. II. 



