a Vegetable Representative System. 153 



within, or by exterior linings of dung, will preserve them 

 equally well. The space requisite for the two pits, the arbo- 

 retum, and the herbaceous ground, amounts to not quite one 

 eightieth of an acre, or, with adequate space for walks, say 

 one fortieth of an acre. 



If the trees and shrubs of the arboretum are planted along 

 the two sides of a double trellis, and trained against it, they 

 need not occupy more than half the number of yards above 

 mentioned, and the herbaceous plants may be planted in a 

 border on each side of the double trellis. This we shall 

 show, in a future Number, by an engraving of the double 

 trellis and border for an incipient Jussieuean arrangement 

 formed in our own little garden. 



So much for the manner of representing all the orders of 

 the flowering plants of the vegetable kingdom, cultivated in 

 Britain, in the smallest possible space. We shall next show 

 how much space would be required to represent not only the 

 orders, but all the fribes. 



By turning to the last page of the table, it will be seen that 

 the number of orders and tribes of hardy trees amounts to 58 ; 

 and the number of orders and tribes of herbaceous plants, 

 including twenty-one groups of rootless Cellulares, amounts 

 to 260. Allowing, therefore, the same space as before, viz. 

 one square yard for each tree, and one square foot for each 

 herbaceous plant, the space occupied by them would be 782 

 square feet, or not quite one fiftieth of an acre. By referrino- 

 to the table below, the number of groups of hot-house and 

 green-house plants to be illustrated will be found to be 146, 

 and consequently the number of square feet of pit requisite to 

 contain them will be 1 46, viz. a pit 25 ft. by 6 ft. 



If the knowledge of an object increases the pleasure deriv- 

 able from it, and if those who cultivate ornamental plants wish 

 to enjoy as much entertainment and instruction from them as 

 possible, would it not be well worth their while, instead of 

 purchasing and cultivating plants at random, without reference 

 to any other qualities than their being fragrant, evergreen, 

 shady, or otherwise ornamental, to purchase and cultivate 

 such plants as would represent more or less of the whole vege- 

 table kingdom ? Would not this kind of cultivation prove 

 highly instructive, as well as entertaining ; and would it not 

 form an important source for the instruction of young persons 

 in botanical knowledge ? To save repetition, the reader is 

 requested to reperuse the articles at p. 300. and at p. 309. of 

 Vol. II. 



Every one may not be able to afford to purchase repre- 

 sentatives of the whole 464 orders and tribes of the hardy 



