SECOND PERIOD. 55 



illustration were exhibited, the remainder of the 

 family under consideration being exposed in the 

 garden. 



Whilst M. Desfontaines thus taught the whole 

 of the science, by describing successively all the fa- 

 milies , M. de Jussieu made a botanical excursion 

 every week into the country. In these walks, be- 

 sides naming the species that offered themselves 

 as he passed, he took every opportunity of re- 

 marking the characters of the different groups 

 of vegetables, and thus exercising his pupils in the 

 application of the principles which he has since 

 made public, in a work that became classical im- 

 mediately on its appearence. 



The method adopted in the King's Garden, 

 and since followed in the different schools of 

 France and in foreign countries , having shewn 

 the order and dependancy of the vegetable king- 

 dom, the prodigious number of plants daily dis- 

 covered, no longer present themselves as insulat- 

 ed beings , but as parts of a general series. 



Chemistry was still confided to two profes- 

 sors , the first of whom exposed the theory and 

 the second performed the experiments. This se- 

 paration ought never to have taken place ; no 

 farther at least than it coincided with that since 

 adopted, by which the task of exposing the prin- 

 ciples of the science, and the experiments neces- 



