280 ON THE OXIDES OF LEAiD. 



placing the beft individuals of their improved breeds in the 

 hands of perfons moil likely to preferve, and further to improve 

 them. 



JOSEPH BANKS. 



Jugiiji 17, 1803. " ; " 



POSTSCRIPT. 



Poftfcripto AS the publication of this report has been delayed by un- 



avoidable circumflances to fo late a period, it is proper to add, 

 that the wools of 1803 have yielded, both raw and fcowered, 

 much as ufual. The prime or R. of the ewe flock were lold 

 for 64'. 9d. a pound, and that of the Rams for 6s. 6d. Thefe 

 enormous prices, however, depended on a fcarcily of imported 

 SpaniQi wool, and are highly difirethng to the manufadurer : 

 they ought not, therefore, to be allowed to enter into the fpe« 

 culation of the grower. 

 Notice of fale of The {beep that can be fpared from the royal flock will be fold 

 can be^f^ d ^-^ ^"^'°" ^'^'^ J^^'' ^^ ^ ^^""^ oppofi^e the Pagoda in Kew-lane, 

 on the 15th of Auguft next. Notice of the particulars will be 

 given as foon as poflible. 



Jul]/ 10, 1804. 



X. 



On the Oxides of Lead. By Thomas Thomson, M, D, 

 Communicated by the Author, 



C/reat Import- Jl ERHAPS there is no pradical branch of chemical invefti.. 

 ^!)ceof theana- ^JQjj ^^ more importance than the analyfis of the metallic 

 lyhs of metallic o \, n ,. , . , „. . 

 oxides; oxides. Almoit every thing relatmg to the metalline paints 

 and falts depends upon it; and it involves, either directly or 

 jndireftiy, moft of the intereiling queftions in the theoretical 

 department of chemiftry. 

 fi.fl applied with Bergman and Scheeie were, I believe, the firft perfons who 

 •:ffeft by Berg- applied chemical analyfis, in the modern fenfe of the phrafe, 

 Sdieele. to the metallic oxides, Notwithftanding the difficulties with 

 which thefe illuftrious chemifts had to llruggle, their experi- 

 ments were made with fo much care and (agacity, that they 

 {till furnifli us" with the beft data for afcerlaining the compofi- 

 ijon of feveral of thefe bodiea. No modern chemift has la- 

 boured 



