156 



Selection of Plants for forming 



The fourth column contains the names of hot-house plants, 

 exemplifying 36 orders, and 82 orders and tribes, not ex- 

 emplified in the preceding columns ; and thus completing 

 the exemplification of the 219 orders, or 464 orders and 

 tribes, composing the natural arrangement of the Hortus 

 Britannicus. 



The names of the orders are preceded by Roman numerals, 

 and the names of both the orders and the tribes are followed 

 by Arabic figures : the former enumerating the orders in 

 series ; the latter, the orders and tribes in series, and their 

 total amount. The numbers in parentheses (1), (2), &c., 

 before the plants exemplifying certain tribes or orders in 

 each column, show the number of orders most conveniently 

 exemplified by that column. The figures not in parentheses, 

 1., 2., 3., &c., in each column, show the number of orders and 

 tribes exemplified by that column, in a regular series, chiefly 

 for garden purposes. 



In planting collections to exemplify the orders only, whe- 

 ther in the open air or in houses, the number of the order 

 should be placed over the name on the label ; and the num- 

 ber denoting its place in the herbaceous ground, arboretum, 

 frame, green-house, or stove, with the signs of the three latter 

 before the name, thus : — 



VI. 



(2.) Berberidece. 



II. 



(1.) 1— 1 Dilleniace-a? Dillenetr. 



In planting collections to exemplify the tribes as well as 

 the orders, the number of the order should be placed over 

 the name ; the number denoting its place in the open garden 

 or house before it, and the number denoting its place in the 

 system after it, thus : — 



It might also be desirable, whether in naming a system of 

 orders only, or a system of both orders and tribes, to place 

 below the name the page in Isindley's Iniroduct ion (30. and 22. 

 as above) in which the order or tribe is treated of, to facilitate 

 the study of each order on the spot in which the plant grows. 



These numbers will also be useful in arranging herbariums, 

 in giving orders to nurserymen, and in making exchanges of 

 either dried or living plants, seeds, or drawings. 



