418 Transactions of the Horticultural Society. 



Anderson of Cashiobury protects beds of endive in this way 

 [fig. 120.), with perfect success. 



46. Account of the Growth of some Cedars of Lebanon at Hope- 



toun House. By Mr. J. Smith, C.M.H.S. 



The cedar of Lebanon increases in girth more rapidly 

 than any other forest tree in the neighbourhood of Hopetoun 

 House. The cedars there were planted in 1748, and in the 

 year 1801, the largest measured ten feet in circumference, at 

 three feet from the ground; in 1820, above thirteen feet, and 

 in 1825, fourteen feet; which increase is comparatively much 

 more than that of any other tree on the estate. The boles of 

 these trees are short, for at no great distance from the ground, 

 they separate into a number of large limbs, which rise almost 

 perpendicularly to the top : this manner of growth, it may be 

 observed, accounts for the short trunk increasing in size so 

 fast, and so much more, than the surrounding trees which 

 have a greater length of bole. But we happen to know, that 

 the cedar of Lebanon is comparatively a quick grower, after 

 it has arrived at a good age. In a fall of timber made at 

 Moor Park, in Hertfordshire, not thirty years ago, the cedars 

 were the largest of many other kinds felled at the same time; 

 many of them containing two hundred and fifty cubic feet, 

 were sold to the London builders for quartering, at the low 

 price of half-a-crown per foot ! 



47. On the Effects produced on Vegetation by the Combination of 

 Heat and Moisture at different Periods of the Year. By Mr. A. 

 Gorrie, C.M.H.S. 



Our esteemed correspondent, after paying a just tribute to 

 the merits of Mr. Daniel, in this department of science, ob- 

 serves that the vegetating season, about Edinburgh, (Prof. 

 Playfair, in Trans. R. S. Edin. 1800,) commences about the 

 20th of March, and ends about the 20th of October ; that 40° 

 is the lowest temperature at which corn will vegetate, and 

 56° the mean temperature of a good vegetating season ; but 

 that in the Carse of Gowrie, nearly half a degree farther 

 north, a good vegetating season seldom occurs, and yet vege- 

 tation there is as forward as in the vicinity of Edinburgh. 

 This, he adds, is a proof that the progress of vegetation is not 

 dependent solely on temperature. The mean temperature of 

 the vegetating season of the Carse of Gowrie, in 1823, was 

 50° 7', and rain 2 1| inches; for 1824, 53° l', and rain 13 T 3 o 

 inches ; for 1 825, 54° 6', and rain 10£ inches. Mr. Gorrie states 

 these facts with a view to excite attention to the subject, and 

 suggests the idea of keeping similar registers in different parts 

 of the island. As general results, it may be noted, that the 

 wettest seasons are the coldest, and that if very dry seasons 



