2*6 Note on Clement and D (forme's Memoir, 



morning, there is a difference of eight hours between Charles- 

 ton and New-York, and of three hours between the latter 

 city and Salem, making in the whole eleven hours. Now, 

 computing the diiiance from Charlefton to New-York at 

 about (Soo miles, and from New-York to Cape Ann more 

 than 3>o, there will be a fea-coaft of almolt uoo mile9 

 fwept over by this ftorm in fome what more than eleven hours. 

 But this computation applies onlv to the fea-coaft; for, if we 

 take any given point, as the city of New-York for example, 

 and inftead of north-eall reckon due north, it will be found 

 that the progrefs is considerably flower : for it took all the 

 time between eleven at night and day-break next morning to 

 reach Albany, only 165 miles diftant in that direction. 



Now, thefe remarks explain fome meteorological facls, 

 which, though of common obfervation, have hitherto feemed 

 paradoxical or unaccountable : for mariners know that, to 

 form a good judgment of wind and weather, they mud keep 

 a look-out for clouds and changes of atmofphere to leeward. 

 In New- York, the rain or fnow which accompanies a north- 

 eaft ftorm can be feen by labourers along the docks and 

 wharves in the fouth-weft at Staten id and, ten or eleven 

 miles diftant, for fome time before it begins in the city, fo 

 as frequently to break off work, and put away their tools. 

 And it is confirmed by long obfervation among the farmers 

 in that vicinity, that fnow-banks, as they term them, are to 

 be feen in the fouth-weft many hours before the atmofphere 

 where, the obfervers are is clouded in the fmalleft degree, or 

 any current of air perceptible. They remark further, that a 

 judgment can be formed of the weather by noting whether 

 the gathered clouds lowering in the diftant horizon are vifible 

 to the northward or fouthward of the fetting fun. If at fun- 

 fet they are to the fouth of the fun, they predict a north-eaft 

 ftorm, with fnow ; if to the north, a fouth-eaft ftorm with 

 fleet or rain. 



XLVIT. Note on the Memoir of Clement and Desorme, 

 entitled Experiments on Charcoal*, By C. Berth ol- 

 let f. 



\^«. Clement and Desorme remark very properly, that 

 all gafes contain, at the fame temperature, the fame quan- 

 tity of hygrometric water. This is fhown by the obferva- 

 tion s of Sauflure and Deluc. Volta afTured himfelf of it 



* See the laft two numbers of The Philofophical Magazine. 

 t From Annates de Cbimie. 



by 



