Vol. lit. MifcelUma Curiofa. ^05 



fandy Grounds that are moft impregnated 

 there\vith, and whofe Nitrous Salt is moft 

 Volatile, for fuch Grounds are , quickliefl: 

 fpent, yield Tobacco's that have the richeft 

 Scent, and that fhortly becomes a pleafant 

 Smoak; whereas, in Tobacco that grows 

 on ftiff Ground, the Salts feem more fix'd, 

 and lock'd up in the Oyl, fo that whilfl: iiew^ 

 'tis very heady and firong, and requires fome 

 time for its Salts to free themfelves, and 

 become Volatile ; which it manifefts, by its 

 having an Urinous Smell. The iame Rea-* 

 fon fatisfies, why Tobacco that grows on low 

 Lands as far as the Salts, tho' the Plant be 

 never overflowed with Salt Water, yet the 

 Ground that feeds the Plant being impreg- 

 nated with Salt Water, that Tobacco Smoaks 

 not pleafantly, and will fcarcely keep Fire, 

 but do all that a Man can, will oft go out, 

 and gives much tfouble in, frequent lighting 

 the Pipe, 'till after it lias been kept fome 

 confiderable time : Vv^hich may be affign'd to 

 the fixeder Saline Particles of the Marine 

 Salt in thefe Plants, which require more 

 time e'er they be render'd Volatile. Here 

 it might be worthy an Enquiry into the Na- 

 ture of. Filtration of Plants, fince we may 

 hence gather, Particles of the Marine Salt 

 are carried along with t\\Q Succm Nutrltius 

 of the Plant i concerning which, if it were 

 not too much to deviate from the Matter in 

 hand, I fliould offer fonle Reflexions of my 

 own, which the Learned Society might per- 

 haps improve : For 1 think thence might 

 be made many happy Conjcftures as to the 

 Virtues of Plants. So where we fee Plant% 



X or 



