PLATES TO THE DISCOURSE. 3^1 



PART OF A PEAR, magnified. 



Shewing the rind and its vefTcls, the calculary and acetary. 

 A, A, A. The little grains or globules, with, the veiTcis radiating from 

 them. 



FLOWERS, 



Two plates; are fully explained by the method of clafTification ac- 

 cording the fexual fyftenn in page 258. 



MOULDINESS. 



This plate exhibits the minutenefs of vegetation, and (hews, that 

 what we call mouldinefs is in reality only a colony of plants. This 

 figure was a fpot found on the red Iheep-fkin cover of a book. The 

 plant has long llender (talks, furmounted by a knob or ball : many of 

 thefe were round and fmooth, as A A ; others fmooth, but not round, as 

 B ; others broken and expanded in various degrees, as C C. The whole 

 was tender, and in fubftance like the common mulhroom. This plant is 

 part of a very numerous tribe, whofe limits of duration perhaps are but 

 Ihort, but which compenfate this brevity by furprifing fecundity and 

 fapid maturity. 



STINGING NETTLE. 



This (hews the whole furface of the leaf, thickly fet with fharp thorns 

 and prickles, A A, each confiding of two parts i one (liarp and tapering 

 to a point ; the other thicker, being a cavity containing a liquor to be 

 ejected from the point into the wound it has made, in the fame manner 

 as a viper's fang. B, is a fort of pearl-like tranfparent globules that 

 grow interfperfed on the leaf, much like oak-apples on the leaves of the 

 oak. C C, the ribs or fap-cana!s, whence all the prickles ifTue, and 

 which furnifh the juice they emit. The fmaller prickles have no juice. 



3 P 2 O B S E R. 



