MEMOIRS 



OF THE 



AGRICULTURAL SOCIETY 



OF 



PHILADELPHIA, 



Some hints concerning Lime^ occasioned by reading Dar- 

 zifin^s Phytologia, By Jolm Lang, 



Read August 9th, 1808. 



WE have for some time past heard much talk about 

 two varieties of lime, the one useful or favourable to 

 the growth of vegetables, when used as a manure ; the 

 other hurtful or pernicious, and therefore not to be 

 used for that purpose ; the first is termed calcarious, 

 the other magnesian lime. 



The first notice we have of this magnesian lime is 

 from a communication of Mr. Tennant, published in 

 the London Philosophical Transactions. 



This is doubtless a subject of great importance to 

 farmers, and in my opinion deserves to be more fully 

 investigated. If all lime which contains magnesia is 

 only useless as a manure, it must be of great importance 

 to our farmers to be informed how they may be able to 

 distinguish this from the calcarious lime ; but much 

 more so if it is as Mr. Tennant says, .destructive to 



VOL. II. A 



