AtnJlatiott.'^Accuuhi of Boiis, 377. 



Aerostation, — Augnjl 12, 1798. 



BLANCHARD afcendcd into the atmofphere, for the forty-fixth time, by means of an 

 apparatus confuling of five balloons attached to a car, and a fixth fmall globe. He threw 

 cut a dog attarheci to a parachute, which defcended gradually, but of wliofe fate no men- 

 tion is made in the Moniteur, whence I extra£t this intelligence. He rofe at half paft noon 

 from Rouen, afcended to the height of 2500 toifes, and landed again at 55 minutes after 

 two, near the village of Bazancourt, 12 leagues diftant from the fir(t place. We have no 

 account of any remarkable obfcrvatlon made during this voyage, nor the reafons why his 

 apparatus was fo complicated. 



Cit. Garnerin, on the 28th ofthe fame month, made his eleventh afcenfion from Paris. 

 His couife for a confiderable time was near the ground, during which he converfed with 

 the people below. Thefe converfations fhewed how much the earth refle£led found ; for 

 all his words were repeated five or fix times. He thought at firfl that it might be governed, 

 by fome local circumftances, which indeed is very probable with regard to the repetition. 

 He defcended feveral times to the fame level, at d fiances of ten leagues afunder, where he 

 conflantly obferved the fame effeft. This great vibration of the air was not fenfible to 

 diftances exceeding 150 or 200 toifes. It decreafes with the diftance. 



Does the vertical tranfmiffion of found differ from that which is made in an horizontal 

 dircftion ? On this head, however, may be read the very entertaining account of Uavid, 

 Frcedlichius, at the end of the 19th chapter of the firfl book of Varenius, who afcended 

 the higheft eminences of Carpathas, near Kefmarkt, in Hungary. It is copied by Der- 

 ham, in the firfl: volume of his Phyfico-Theology. 



This aeronaut was accompanied by a female Citizen, Henry. They rofe at 25 minutes 

 after four, and defcended at nine in the evening, at the gates of Chalons, forty leagues 

 from Paris, and thirty-feven from the place whence they departed. 



Effays Political, Economical, and Philofophical, by Benjamin Count of Rumfbrd. 



tffays Vill. and IX. 



THESE two EiTays have been before publiflied in the Philofophical Tranfa<fiions ; the 

 one as long ago as the years 1786 and 1792, and the other in 1798. As this laft is inferteJ 

 in our Journal, Vol. II. p. i«6, it will be unnecelfary to infert its contents in this place. 

 Both will be highly acceptable to the poffefibrs of the other Effays of the Count, to complete 

 the collection of whick thefe were wanted. 



The contents ofthe eighth Effay are, Chap. I. An Account ofthe Inftniments that were 

 prepared for making the propofed Experiments. A Thermometer conftrucftedj whofe 

 bulb is furrouiided by a Torricellian Vacuum. Heat is fou-nd to pafs in a Torricellian 

 Vacuum with greater difficulty than in Air. Relative conducing Powers of a Torricellian 

 Vacuum and of Air with regard to Heat, determined by Experiment. Relative ccHidudting- 

 Powers cf dcv Air and of moift Air. Relative conducting Powers of Air of different de- 

 grees of Denfity. Relative condudling Powers of Mercury, Water, Air,>nd a^ Torricellian 

 Vacuum.— Chap. II. The relative Warmth of various Subft^ances ufed in making Artificial 

 Clothing, determined by Experiment. Relative Warmth of Coverings of the fame Thick- 



