THE BOTANIC GARDEN. 169 



was left standing when the garden was enlarged. 

 Near one of the gates on the avenue of limes, are 

 two rose-trees grafted upon the eglantine, whose 

 tops are covered with flowers of different spe- 

 cies, at fifteen feet from the ground. 



Varieties are not admitted into the botanic 

 garden unless they are constant, and in other re- 

 spects remarkable, as they would occupy time 

 and space which are better bestowed upon 

 primitive types of species. In the fine season 

 the contents of the hot-house are exposed upon 

 a mound in front of the building (1). 



Botany is too extensive a science to be learned 

 in a single year. Those whom a decided taste 

 attaches to this study, should proceed with me- 

 thod, and avoid embracing too great a variety of 

 objects at once : during the first season they 

 should content themselves with verifying on 

 several species the characters of the genera 

 treated of by the professor, and the following 

 year, should resort to the garden at the open- 

 ing of vegetation, and examine all the plants in 

 succession, as they bloom and mature their seeds. 

 Between the spring and autumn, persons who 



the falling of the leaf. M.Michaux has named it the virg'dia lutea on 

 account of the yellow colour of its wood. — See History of the Trees of 

 North America, vol. in. page 266. 



(1) It is of less extent this year than formerly, as one-third of it is 

 occupied by the new hot-house, constructed in 1821, 



