126 PHILOSOPHICAL TRANSACTIONS. [aNNO J723. 



The child was continually drawing up the lower limbs, and straining at both 

 sphincters; the urine seemed to pass with difficulty for some days, till at last 

 there came on a total suppression, and the worm advancing, showed itself at 

 the extremity of the urethra, when the apothecary was called up to help them. 

 The insect measured above 4 inches, resembling the worms usually voided by 

 the anus, of the earth-worm kind, but whiter. The apothecary said, that, 

 when he came to the child, he saw a preternatural body, which at first he knew 

 not what to make of, hanging 4- an inch out of the glans, and lying double in 

 the passage: perceiving it farther advancing, he took hold of it, and with little 

 difficulty drew it forth. 



The summer before the last, a woman showed Dr. T. an insect of the mag- 

 got species, with a crusty red galea over the snout, and a crescent or forked 

 tail, which she had just then voided by the urinary passage. 



j4n j4ccount of a Netv Machine, called the Marine Surveyor, contrived for mea- 

 suring a Ship's Way in the Sea, more correctly than by the Log, or any other 

 Method hitherto used for that Purpose. By Mr. Henry de Saumarez, of the 

 Island of Guernsey. N° 301, p. 4] 1. 



The primum mobile of this machine is in the form of the letter y, and is 

 made of iron, or any other metal ; at each end of the lines, which form the 

 angle, or upper part of that letter, are two pallets not much unlike the figure 

 of the log; one of which falls in the same proportion as the other rises. The 

 falling or pendent pallet meeting a resistance from the water, as the ship moves, 

 has by that means a circular motion under water, which is faster or slower 

 according as the vessel moves. This motion is communicated to a dial within 

 the ship, fixed either in the master's cabin, or any other place, by means of a 

 rope of any convenient length, fastened to the tail of the y, and carried to the 

 dial. The motion being thus communicated to the dial, which has a bell in it, 

 it strikes exactly the geometrical paces, miles, or leagues, which the ship has 

 run. Thus is the ship's distance ascertained ; and with equal ease may the forces 

 of tides and currents be discovered by this instrument. 



In fig. 1, pi. 3, AKCL and bhdi are the pallets, worked from the legs de and 

 CE into the form they appear, to a breadth of about 4^ inches. The length 

 of the pallets bd and ac is 8 inches. The branches or legs, de and CE, are 

 each \b\ inches long, and 2 in circumference; and the angle ced,. contained 

 between them, is 45 degrees. The shank ef is of the same thickness as CE 

 and de, and is 27 inches long. At the point f is a ring, where one end of the 

 rope FG is hooked to the machine, the other end g being fixed to the dial 



