>3^ jinaJ^^t of MattachanUefrmi Botany Bay, 



with regard to temperature. If certain graiTes of good quality fhould grow at a temperature ' 

 lower than that at which others will grow, it would evidently be defireable to have winter 

 paftures and water-meadows of fuch gralTes. 



It would likewife be defireable to extend thefe experiments to our highcft fummer heat, 

 with.due attention to moiflure and^light. 



I am, SIR, 



Tour's refpeftfully, 



THOMAS BEDDOES. 

 Clifton^ June^, 1801. 



III. 



Anal^ts of Manachaniftfrotn Botany Bay. By RlCBARD Cbevekix, Efq. F.R. S. and 

 Af. R. I. A. Commumcated by the Author, 



A) 



iBOUT three months ago, I received from the Right Honourable Prcfident of the 

 Royal Society, a quantity of fand, which had been found on the fea coaft in Providence 

 Ifland, and thence brought over to England in the courfe of the winter. It may not be 

 very eafy to determine the mineralogical character of any fubftance in the ftate of fine 

 powder} but, from its general appearance, the objeft of our prefent inquiry was judged to 

 be Manachanite. It was in fine grains, almoft as fmall as fea fand ; it was mixed with, 

 many white, and fome red globules of the fame fize with the black; and, in this alone,, 

 differed from the manachanite of Cornwall. The white globules feemed to be quartz ; and 

 the red, as far as could be judged, appeared to be garnet, more than ruby. The fpecific 

 gravity of fo fine a fand, I did not think a charafter more certain than any other; therefore 

 did not give myfelf much trouble to take it with accuracy. From the rough experiment P. 

 made, it did not appear to be very diflferent from that of the known manachanites. It was- 

 flightly magnetic alfo ; but not fatisfied with any external marks, I proceeded ta try what 

 information I could receive from chymical analyfis. 



loo parts of the above fand from Providence Ifland, were expofed to a red heat for half 

 an hour, and weighed upon cooling, No fenfible augmentation or diminution of weighth^di 

 taken place. 



Sulphuric, nitric, muriatic, and nitro-murfatic acids,, were heated for twelve hours upon^ 

 a given quantity}, and, upon trial, with various rc-agcntsi exhibited no marks of having; 

 ■operated an effeftual folutton. 



», I then took one hundred grains, and'treated them with pot-afh, in aplatina crucible, 

 ia ' the ufual manner of treating hard ftoncs. In about two minutes after the pot-afli was in 



ftt£ion. 



