C 233 3 



this attempt, and an enumeration of thofe natural 

 or artificial orders in botany, which are fuppofed 

 to illuftrate and confirm the poffibility of attain- 

 ing this defirable end. To mention a few in- 

 ftances of this agreement in charadler and qualities: 

 The ftellated clafs, in Ray^s fyflem, are moftly 

 diuretics \ the afperifoli^^ are chiefly demulcents ; 

 the umbelliferous plants, which grow in dry places, 

 are aromatics^ particularly the roots and feeds ; 

 but if growing in wet iituations, ufually partake 

 more or lefs of a deleterious quality. The Icofan- 

 drous plants of Linn^us abound with pulpy and 

 efculent fruits : the Polyandrous are many of them 

 poifonous : the Syngenejious^ in frequent inftances, 

 intenfe bitters^ &c. It moil not be concealed, how- 

 ever, that there are not wanting thofe who confider 

 both xh^ natural method in botany, and the deduc- 

 tion of the virtues of fimples from thefe congruities^ 

 as the philofopher's ftone of the fcience ^ notwith- 

 ftanding which, there is no attempt in the im- 

 provement of botany, or its true application to 

 the ufes of phyfic, which ought more ftrenuoufly 

 and unremittingly to be purfued, than that of 

 bringing to all poffible perfedion the purpofe of 

 tkis difTertation, 



15. De Chrystallorum Generatione, 

 M. Kahler, 1747. 



In this tra61: is difcuffed at large, that opinion 

 which LiNN^us early imbibed^ and which led 

 him to afcribe to the operation of one and the 



fame 



