246 Observations upon the effects of Frost, 



represented by Port Jackson, and 2nd the southern part of the 

 continent including Van Diemen's land ; and under south America 

 in like manner, the plants of the plains of Chili, those of the 

 mountains, of the opposite side of the continent, and of the south- 

 ern extremity, should have each had its separate head. But the 

 time has not come for such approximations to exactness ; and no 

 one is yet in a condition to look at the refinements of a general 

 investigation of the connection between vegetation and climate. It 

 will moreover be endeavoured, in the remarks hereafter to be made, 

 to guard against drawing erroneous conclusions from too great an 

 extension of geographical boundaries. 



Australia. 



Acacia armata and verticillata survived the winter of 1836-7, but 

 were now killed at Sketty : in the spring of 1837 Mr. Dillwyn 

 turned out some other species which had been hardened in a 

 cold frame, but they all died except A. qffinis and pubescens. 

 A. qffinis also survived at Glasgow ; but though on a wall it 

 was killed to the ground. At Norwich a plant of A. dealbata 

 six inches in diameter at the ground was killed. In the So- 

 ciety's Garden every species perished, some having been 

 growing for several years without suffering materially from 

 winter cold. At Carclew A. stricta and qffinis proved more 

 hardy than any others, although both were slightly injured ; 

 A. Sophora was killed to the ground at this place in 1830-1, 

 but had subsequently attained the height of 15 or 16 feet; 

 after the frost the branches required to be shortened, but there 

 was no appearance of the stem being cracked and injured and 

 the plant* became healthy ; A. verticillata, which had been out 

 for several years, and was about 15 feet high, was greatly da- 

 maged ; in the course of the summer it made an effort to 



