By Professor Lindley. 



a place affected by water in winter. Whatever tends to render 

 tissue moist will increase its power of conducting heat and con- 

 sequently augment the susceptibility of plants to the influence of 

 frost; and whatever tends to diminish their humidity, will also 

 diminish their conducting power and with it their susceptibility; 

 this is an invariable law, and must consequently be regarded as a 

 fundamental principle in Horticulture, upon attention to which 

 all success in the adaptation of plants to a climate less warm than 

 their own will essentially depend. The destructive effects of frost 

 upon the succulent parts of plants, or upon their tissue when in 

 a succulent condition, may be thus accounted for, independently of 

 the mechanical expansion of their parts; indeed, it is chiefly to that 

 circumstance, that Dr. Neuffer ascribes the evil influence of cold 

 in the spring ; for he found, that at Tubingen nearly all trees con- 

 tain 8 per cent more of aqueous parts in March than at the end of 

 January; and the experience of the past winter shews, that the 

 cultivation of plants in situations too much sheltered, where they 

 are liable to be stimulated into growth, and consequently to be 

 filled with fluid, by the warmth and brightness of a mild protracted 

 autumn, exposes them to the same bad consequences as growing 

 them in damp places, or where their wood is not ripened, that is 

 to say, exhausted of superfluous moisture, and strengthened by the 

 deposition of solid matter, resulting from such exhaustion. 



INDEX OF THE PLANTS MENTIONED IN THIS REPORT. 



Abies Douglasii, 242, 260. 



— Deodara, 237, 240, 242, 2G3. 



— Webbiana, 210, 212, 2(>3. 



— Morinda, 242, 263. 



— nobilis, 212, 250. 



— Menziesii, 260. 



grandis, 250. 

 i dealbata, 2 12, 216. 247 



afiini-. -12, 246. 



Juiiln-issin, 242. 



diffusa, 210, 242, 247. 

 . ii. 2nd series. 



■if..lia. -'17. 



nata, 247. 

 rens, 247. 

 nxvlon, 217. 



