gether with the vaft quantity of new materials aS 

 quired from all parts of the world, enabled our 

 author greatly to elaborate this laft edition, and to 

 amend very many generical and fpecific charaders ; 

 as alfo to make many removes, tending greatly to 

 the advancement and perfedlion of his work. 

 Among thefe removes, many have taken place, 

 particularly in the Monoecious^ Dioecious^ and Polyga- 

 mous clafTes ; which is the lefs to be wondered at, 

 fince obfervations have confirmed, that there arc 

 plants of thefe claffes which, in their younger fiate, 

 have produced only male flowers, afterwards both 

 male and female, and at length only female. 



The Species Plantarum contains near feven thou- 

 fand three hundred plants. In this volume, the 

 number is augmented by the addition of new 

 plants, and fuch as were unknown by our author 

 before, to above feven thoufand eight hundred. 



It is proper to remark, that this fecond tome 

 of the Syftem was immediately preceded by Man- 

 tissa Plantarum Generum, editionis fext^e^ et Specie- 

 rum editionis fecund^. Holm. 1767, pp, 142. in 

 which are defcribed, as in the Genera Plantarum^ 

 the natural charadters at large of forty-four ^^;/^r^, 

 newly conftrudled. Thefe are followed by an enu- 

 meration of upwards of four hundred and thirty 

 new fpecies, with their fynonyms, as in the Species 

 Plantarum. All thefe plants are included in the 

 volume of the Syftem of which we have juft given 

 the account. 



ToMf 



