10 BAROMETRICAL VARXATIOW. 



from time lo time, would probably have anfwered without 

 Caution regard- llie Brunoiiian theory. But it is certainly the bufinefs of the 

 i.ig particular p|,yfician to avoid gaCeous oxide in the hyfterical, as it is wine 

 Quzre.* '" thofe who labour under acute inflammation. If your cor- 



refpondcnt who related his own feelings could fpecify any caufe 

 which niiglit have rendered him nervous, or ftate the fa6l 

 whether he was fo or not, it would give fatisfadion to the 

 prefent writer, and perhaps alio lo future inquirers. 

 Remark on dan- To interdict a remedy becaufe its ula requires difcrimination, 

 _^erousdJforders. vvouid, in many diforders, be leaving the fick to certain de- 

 ftrudion. I imagine that the outcry againfl fuch means as ga- 

 feous oxide, will arile from thofe who daily ufe the moft hazard- 

 ous remedies, and who are enabled to do it without reproach, 

 becaufe they are put into a phial, and the patient and his friends 

 never trouble themfelves about the nature of the articles which 

 ihey are receiving into thefiomach. 



IV. 



AhJiraB of Obfervut'ions on a dhtrnal Variation of the Barometer 

 between the Tropics. By i. Horsburgh, Efq. In a Letter' 

 /o Henrv Cavendisu, Efq. F.R.S* Read March 14, 

 1805. 



SIR, Bombay, April, 20, 1 804., 



Tropical varia- VV HEN I was in London at the conclufion of the year 1 80 1 , 

 tion of the ba. j j^^^j ^i,g pleafure of being introduced to you by ray friend 

 Mr. Dalrymple, at which time he prefented you with fome 

 flieets of meteorological obfervations, with barometer and 

 thermometer, made by me in India, and during a paflage 

 from India to England. 



Being of opinion that few regifters of the barometer are 

 kept at fea, elpecially in low latitudes, I have been induced to 

 continue my obfervations fince 1 left England, judging that, 

 even if they were found to be of no utility, they might at lead 

 be entertaining to you or other gentlemen, who have been 

 making obfervations of a fimilar nature. 



During my laft voyage 1 have employed two marine ba- 

 rometer?, one made by Troughton, the other by Ramfden, 



* Philofophical TranfeftioBS, 1805. 



and 



