8 CRAIB—REGIONAI, SPREAD OF MOISTURE IN Woop OF TREES. 
One other point must be noted. The graphs show a com- 
paratively high moisture-percentage in the centre of the trunk. 
How far this is a result of the gale I cannot say as the whole 
series of experiments on moisture-spread was interrupted before 
another Populus could be examined to elucidate this point. 
- The absence of a graph for the bottom cut in the N—S direction 
* explained by the fact that the tree was not quite sound on the 
north side at the point selected for the cut. 
For the material on which the previous and present papers are 
based I am indebted to the late Sir I. B. Balfour. Not for the material 
alone, but also for his encouragement throughout the lengthy 
and laborious experiments and for his friendly advice and 
criticism I wish now to express my sincere gratitude. Mr R. L 
Harrow, F.R.H.S., Head Gardener, Royal Botanic Garden, as 
before, arranged and saw to the carrying out of the details of the 
felling operations in a very satisfactory way. For the original 
painting of the wood of Taxus I am indebted to Miss L. Snelling. 
hae We PLATES (CLAAA-CRC) 
Illustrating Professor Craib’s Paper on Moisture-Spread. 
PLATE ee erry es ep ge in bole of Acer Pseudo- 
plata in Augu 
CUXXXI, —transverse and ie tudinal sections of newly felled 
Taxus baccata showing heart-wood and sap- 
CLXXXIT. Moisture distribution throughout the trunk of Acer 
idoplatanus in April. 
CLAS — De do. do. do. in May (1). 
CLAS TV i— Do. do. do. > in May (2). 
CLASKV — Do. do. do. in August, 
CLAXX VI. We ey distribution eroughon the trunk of Ilex 
quifolium in December 
CLXXXVIT,— Do. do. do. a in February. 
CLXXXVIIL.—Moisture distribution thro the ¢ trnnk«vof 
Chamaecyparis pisifera in ig ies 
Ser es ee oo throughout the trunk of Taxus 
i vember. 
CeCe Sie a sae tion throughout the trunk of wind- 
blown Populus trichocarpa. 
¢ 
explanation of methods adopted in these plates se en 
published in Notes Roy. Bot. Gard, Z. dn, VOL ah. No rE € previous paper 
