404 PHILOSOPHICAL TRANSACTIONS. [aNNO 1720. 



certain, that we had the leprosy among us before: for Wharton, de Episcopis 

 Londinensibus, and other historians assure us, that Hugo de Orivalle, one of 

 the bishops of London, died here of the leprosy in the year 1084; which 

 proves that our countrynnen did not bring that disease first from the Holy War, 

 because we had it among us before. The account William of Malmesbury 

 gives of this bishop's disease, is as follows. Is post paucos ordinationis annos 

 in morbum incurabilem incidit. Siquidem regia valetudo totum corpus ejus 

 purulentis ulceribus occupans ad pudendum remedium transmisit. Nam credens 

 asserentibus unicum fore subsidium si vasa humorum receptacula, verenda sci- 

 licet, exsecantur, non abnuit. Itaque et opprobrium spadonis tulit episcopus, 

 et nullum invenit remedium, quoad vixit leprosus. Now it is highly probable, 

 that had this been a new disease the bishop died of, the mention of it as 

 such, would not have escaped our historian ; but on the contrary it seems to 

 have been anciently known among us, because the remedy made use of for it 

 was so, it having been recommended by ^tius, and other physical writers 

 several hundred years before this time ; and I think it is very plain that the 

 cutting off the testicles, and with them the vessels formed for the receiving 

 the humours as expressed in the former case, was by them thought to be of 

 peculiar service, because it is probable that observing the disease to begin in 

 these and the neighbouring parts, they thought the very minera morbi would 

 by this means be destroyed, and the disease either cured, or the spreading of 

 it prevented. 



An Experiment to compare the Paris Weights with the English. By the Rev, 

 J. T. Desaguliers, LL.D. F.R.S. N° 366, p. 112. 



Finding the accounts we have of the French weights different in different 

 books, 1 sent to a curious gentleman for some Paris weights exact to the 

 standard weights at the Chatelet; and found on trial, that the Paris ounce, 

 which contains 5/6 of their grains, is equal to 476 of our grains Troy: from 

 which experiment all the other proportions may be deduced. Note, 



The French pound contains 16 ounces — the ounce 8 drachms, or 576 Paris 

 grains — the drachm 3 deniers — the denier 24 grains. 



Some Remarks on the Method of observing the Differences of Right Ascension 

 and Declination by Cross Hairs in a Telescope, " By Dr. Edm. Halley, 

 R.S.S. N°366, p. 113. 



Those that are curious in observing the heavenly motions, and particularly 

 myself, whose business it is, are greatly obliged to the late Siguier Cassini for 



