ERUPTIONS OF LUNAR VOLCANOS. Qjj 



Gadolinite when pure is hard enough to give fire with fteel. it is hard ; 



It is found cry ftallized in an imperfect manner like fomeciyftallizedj 

 fpecies of garnets* 



It contains glucine. contains glucine. 



Befides the diftin&ions between gadoline and glucine efta- Gadoline and 

 bliflied by Klaproth and Vauquelin, thefe earths differ in the S lucine diffcr 

 following peculiar properties. 



The fpecific gravity of gadoline differs confiderably from in fpec. gravity. 

 that of glucine, which is only 2,967, whilft that of gadoline is 

 4,842. This laft earth is the heavieft of all the known earthy 

 fubftances, fince it is 0,842 heavier than barites, which only 

 weighs 4,000. 



It is foluble in the alkaline carbonates. Gadoline is fo- 



It is abfolutely infoluble in the cauftic alkalis. lub i e in alkdinc 



. . r - carbonates. 



It is not precipitated by the fuccinates as glucine is. not in pure alk. 



nor (like glu- 



..,' " ■ • ' ' ; ■ r ' " ' i f'"p) precip. by 



fuccinates. 



On the Probability that the Eruptions of Lunar Voicanos may reach 

 the Earth. By J. B. 



To Mr. NICHOLSON. 

 SIR, 



Cambridge, Nov. 6, 1802. 



JL HE fact of ftony and metalline fubftances having at differ- Stones fallen on 

 €nt times fallen on the earth, feems to be confirmed by fuch the earth * 

 thong evidence, that a doubt can fcarcely remain as to its 

 reality ; permit me through the medium of your Journal, to 

 offer to your readers an attempt to account for this phenome- 

 non. The exiflence of lunar voicanos, atleaft equal in mag- Lunar voicanos, 

 nitude to thofe of the earth, has been proved by ocular de- 

 monftration. The velocity with which a body muft be pro- Velocity of a 



je&ed from the moon's furface fo as to be carried within the P r0 J eft '^ Cob f, 

 ** thrown from tno 



fphere of the earth's attraction, is about 12,000 feet per fe- moon. 



cond ; now when we confider the height to which volcanic 



fubftances are projected during an eruption, and h6w very 



considerable a part of fwift motion muft neceffarily have been 



deftroyed by therefiftance of the atmofphere, I think it by no 



means improbable, that the force exerted may be confiderably 



greater than would be neceflarv to carry a body 12,000 feet in 



* vacuo. 



