PixeJ Vegetahk Alkali ^ ^c, 7^ 



it can be feen free from dud, examined with a 

 magnifier, appears to be formed by a congeries 

 of fpicula of this oblong hexaedral form, a mode 

 of cryftaliization, which neither the folTile alkali, 

 nor cubic nitre effedl. Thefe experiments (hew, 

 that the ritre thus colledted, has neither a cal- 

 careous, nor a volatile alkaline, nor a fofUl 

 alkaline, bafe, but is in every rcfped ^tvicdi. 

 nitre, generated principally by the putrefadion 

 of animal m;}tters, certainly without the artificial 

 addition of any prepared vegetable fubftance, 

 (prepared at leaft by fire) to fupply the vege- 

 table alkali. 



If you fliould think, Sir, upon perufal, that thefe 

 obfervations will afford any amufement to the 

 Society, you will oblige me by communicating 

 them. If, on the other hand, you fhould think 

 them too trifling, fuperficial, or tedious, I beg the 

 favour of you to fupprefs them. And am, 



"With great regard, 

 "Your fincere friend, and humble fervant, 



U. W A L L. 



Some 



