SCIENTIFIC NEWS. 207 



ijeans as Mont Blanc is that of the Alps. This mountain co^ 

 vered with glaciers and eternal fnows, which is elevated 

 more than eighteen hundred toifes above the level of the fea ; 

 and rifes higher than all the granitic Pics except Mont Blanc, 

 muil neverthelefs be ranked among ternary mountains, fince it 

 contains the remains of fea animals and quadrupeds. The 

 efforts of Ramond to reach the fummit have till now been con- 

 ftantly unfuccefsful, and he is the only one who has yet accom- 

 plished it. It prefents on all fides threatening projections and 

 fleep precipices. This time* inftead of directing his courfe 

 from north to fouth by afcending the mountain on the French 

 fide, he travelled from fouth to north by the Hope which is 

 dire&ed towards Spain. He will foon publifh the interefting 

 recital of his afcenfion. 



Experiment on Sound. 



In the Journal Iafi quoted, there is an account or notice of Low Sounds faid 

 an experiment performed in the palace of the Tribunal, which *° c< J i yj ycd 

 as there is fome obfcurity probably owing to the concifenefs of tances. 

 the narrative, I tranflate literally. 



Two figures of the fize of life placed at the extremity of 

 a very extenfive apartment, hear fpeaking with a very low 

 voice in whatever pofition and however diftant the perfons 

 who fpeak to them may be, and they anfwer all queftions in 

 the molt fatisfactory manner. 



This curious experiment proves to philofophers, that it is 

 poffible to affift the organ of hearing in the fame manner as 

 inftruments have been contrived to affift the fight. 



The author affirms, that it is poffible to tranfmit intire dif- ^ 



jcourfes uttered in a low voice to very remote diftances, with- 

 out any indication of the place of the fpeaker. 



Evaporation of Water at an elevated Temperature. 



M. Leindenfroft, in a dhTertation publimed in 1756, an- Experiments on 

 nounced, that water lofes the quality of evaporating accord- evaporation, 

 ingly as the heat of the bodies upon which it falls, is aug- 

 mented from the point of ebullition to the temperature of a 

 white heat. A d{op of water which he let fall into an iron 

 ladle heated to whitenefs, was firft divided into feveral fmall 

 globules which afterwards united in one. Confidering this 

 with attention, he obferved, that it turned with great f'wifu. 



nefs 



