THE BOTANIC GARDEN. l63 



All these plants cannot remain constantly in 

 the botanic garden, as some are too delicate to 

 support the air, and others too rare to be exposed 

 without precaution ; but they are all exhibited 

 when the family to which they belong is treated 

 of in the lecture, and they may be studied in the 

 hot-houses, when in flower, by applying to the 

 professor or headgardener. Many annual plants 

 of short duration are sown at different periods, 

 that they may be found in the garden after they 

 have disappeared from the fields ; and some 

 which grow naturally in marshes, in forests, and 

 on the sides of hills, and which it is found impos- 

 sible to rear, as several of the pediculares and 

 orchidece, are renewed from the country as 

 often as they perish. 



All the plants are labelled: the large red 

 tickets indicate the classes and families ; the labels 

 of the genera are placed above those of the first 

 species; and those of the species, besides the 

 Latin and French names, the country of the plant, 

 and the signs of its duration and habits, indicate 

 by coloured lines its use in medicine, domestic 

 economy, the arts, or ornamental gardening, and 

 the character of its juices (i). The catalogue by 



(i) The red stripe signifies that the plant is used in medicine ; the 

 green that it is employed in domestic economy; the blue in the arts; 

 the yellow in ornamental gardening; and the black that it is venemous. 



1 1. 



