Aquatics ill hot Watery in the open Air. 71 



One tree measures in circumference 7l^in. ; two trees, 68 in.; 

 and one tree, 67 in. Tlie average of those near the rivulet is 

 from 62 in. to 68 in. ; but those farther from the stream are 

 smaller. The measurable solid wood, above 6 in. in diameter, is 

 30 solid feet on two of the largest ; and other two measured 

 25 solid feet. Two have lately been blown over by the wind, 

 which stood without the reach of the stream, and which measured 

 76 ft. in leno-th : the tallest measured about 80 ft. in length. On 

 cuttino- up the wood in deals, it has a beautifully waved bird's- 

 eye appearance, and acquires a smooth glossy surface. The 

 trees have now stood twenty-four years ; and one of the largest 

 measures within a fraction of 1 in. in diameter for every year it 

 has stood ; and now the accumulation of solid wood is yearly in- 

 creasing in proportion to the extent of the circumference. The 

 solid wood of the largest measures 1 ft. 3 in. for every year it has 

 been in the ground. Upon the whole, I continue of opinion that 

 few trees can come in competition with the *Salix alba for rapidity 

 of o-rowth, elegance of appearance, and value as timber. Those 

 who have the First Volume of your Magazine will be kind enough 

 to correct an error in p. 45., line 11. from bottom, and write with 

 a pen, " bulk" in place of ^^hark for fuel." 



Aimat Garden, Oct. 11. 1836. 



Art. X. Results of an Attempt to grow some tender Aquatics in hot 

 IVater, in the open Air. By Richard Christie, in a Letter to 

 W. Christie, jun. Communicated by the latter ; with Remarks. 



In reply to your request that I would send you some account 

 of the plants grown here last spring, I must first premise that they 

 were intended for an attempt at cultivating them in the hot-water 

 reservoirs in the garden attached to the factory. The water used 

 for condensing in the engine-house soon becomes very hot ; and, 

 in order to cool it for subsequent use, it is conducted about the 

 garden in shallow stone gutters, and from them into several large 

 reservoirs, 6 ft. or 7 ft. deep. The temperature of the reservoir 

 in which the plants were placed has varied considerably during 

 the summer, as I will notice hereafter. The plants, consisting of 

 three small roots of A^ymphae a caerulea, several of Limnocharis 

 Humboldt//, and a very small one of Ponteder/a aziirea Bat. 

 Mag. (P. crassipes Hart.), arrived about May 8. The Ponteder/« 

 having been lost almost immediately, I shall take no farther 

 notice of it, but confine my remarks to the iVymphaB\a and Lim- 

 nocharis. Two i:)lants of the former, and one of the latter, I 

 merely threw in with the roots enclosed in a ball of clay to sink 

 them : the others were sunk in two small baskets filled with clay. 

 The reservoir being puddled with clay at the bottom, the roots, in 



