258 TEANSACTIONS AND PROCEEDINGS OF THE [Sess. LXiv .' 



factors had been equal in all years, and if older trees grew 

 at the same rate as young ones, would be 35'7 per cent, 

 for five years, and 6 4 "3 per cent, for nine years. 



The attempts I have made to ascertain the value of 

 certain weather-factors in influencing tree-growth do not 

 seem to prove anything in particular, except that rain 

 is more essential than anything else; and this is borne out 

 by a comparison of the weather of the five-year period with 

 that of the nine-year period. 



Inches Raix. Hours Sun. 



Mean 

 Temperature. 



For the Five-year Period 48-82 2786 (50°-4 



For the Nine-year Period 42-01 3085 60°-6 



For Eighteen Years, to 



December 1898 . . 44-12 2960 60°-7 



We need not suppose that the annual surplus of 6 '8 

 inches of rain for the five-year period made all the 

 difference between the growth of that and the nine-year 

 period ; for there can be little doubt that trees grow faster 

 in their earlier than in their later years. 



And it would seem that advancing age impedes the 

 growth of deciduous trees more than it does that of 

 evergreens. 



Additional Notes on Andromeda Tolifolia, Linn 

 With Special Reference to Two New" Stations. Also 



IiEMARKS UPON THE ToXIO rilOPERTIES OF AnDROMEDA 



roLiFOLiA, Linn., and other Members of the Ericaceae. 

 By Symington Grieve. 



(Read 14th Deceinlier 1899.) 



Last January 1 read to this Society a paper entitled 

 " Some Notes on Andromeda folifolia, Linn." It was then 

 suggested that I should make some further investigations 

 regarding the distribution of the plant in Liddesdale and 

 Eskdale, and, if possible, find out if it was still growing on 

 the Solway Moss, where Dr. Lightfoot collected it in 17712. 

 Hence the following notes and observations. 



On 31st January 1899, Dr. William Craig was good 

 enou'^h to inform nie tliat he had heard from a gentleman that 



