34 TRANSACTIONS OF ROYAL SCOTTISH ARBORICUI.TURAL SOCIETY. 



5. Observations on the Annual Increment of Spruce 

 and Scots Pine (Third Article). 



Pjy J. II. MiLNE-IIoMi:. 



The account ofprevious observations in 19 10 and 1911 has been 

 given in the Transactions (Vol. xxiv. p. 52 and Vol. xxvi. p. 160). 

 The following tables summarise the results obtained in the 

 growing season 191 2. The percentage rates of growth have 

 been calculated in the same manner as in previous years. 

 « = the number of rings in the last inch of radial growth, and 

 <f= diameter of stem under bark. 



The following figures for 19 10 and 191 1 were given previously, 

 but are repeated for reference with the addition of the corre- 

 sponding figures for 1912 : — 



