90 RemarkaUe Cases of Venereal Infection. 



65, tbe incliiuition of the orbit and the positions of the 

 ascending node and of the pcrihi'lion. 



When the arc observed of the orbit of a comet is con- 

 siderable, and particuiarlv when it extends beyond 90" of 

 anomaly, where ihe elHpliciiy begin!* to become perceptible; 

 it will l)e desirable that we should have four observations 

 made with all the precision which we ought to expect from 

 modern astronomy, taking cure to verify the position of the 

 stars to which we refer the motion of the comet. 



Whatever may be the precision with which we strive to 

 make these observations, they will always leave some un- 

 certainty as to the time of the revolution of conjets : the 

 most accurate method for determining it, is to compare the 

 obscrvaticns of a cojuet in two consecutive appearances; 

 the resemblance of the elements of the two parabolic orbits 

 determined by these observations, will make known the 

 identity of the comet, and we shall have, by the difference 

 of the instants of the perihelion passage, the time of its te- 

 volution and its grand axis. It was thus that the period of 

 the comet observed in J 331, I6fi7) 1682, and 1759, wa? 

 delermined ; a period which is a little unequal, on account 

 of the attraction of the planets, as M. Clairaut bus shown, 

 bv subjecting to analysis the perturbations experienced by 

 this comet from Jupiter and Saturn, 



XIV. Account of some remarkable Cases of Venereal 

 Infection. 



To Mr. Tillock. 



Sir, i F.RMiT me to communicate some medical facts 

 which lately occurred in niv practice; and as there is not 

 anv sufferer upon whoiri the circumstances can reflect dis- 

 honour, or whose delicacy can suflfer by the relation, an 

 insertion of the entire matter in your instructive Magatiine 

 mav convey orisiinal information to professional men, and 

 will oblige Your obedient servant, 



Robert He alt, M.B. 



On the 23d of July ISJO, I was requested by a respectable 

 friend to see his wife, who complained of great and general 

 debility, loss of appetite, with violent pain of the head. She 

 was nursing, I'iie nhild seemed very healthy. She said she 

 was atlacke-J with ha!morrhi)ids about three weeks after her 

 lying-in, wliich was on the lllh of May 1810. She had 

 had small glandular swellings in her gToins, which had sub- 

 sided ; 



