Crain—REGIONAL SPREAD OF MorstURE IN Woop OF TREES. 5 
These results and their bearing on the tree-felling period are 
referred to under Coniferae. 
III. Evergreen Broad-Leaved Trees (Plates CLXXXVI- 
CLXXXVII). 
The experiments proposed on evergreen broad-leaved trees 
were unfortunately interrupted and of the series of Ilex Aqut- 
folium selected for examination only two trees were felled, one on 
5th December 1918 and the second on 15th February 1919. From 
-an examination and comparison of the graphs of the moisture- 
distribution of these two trees, however, one may conclude :— 
1. ‘That in the Holly moisture is stored in the centre. This 
is shown in the graph of bottom cut of the December tree (Plate 
CLXXXVI) where moisture is stored in the heart-wood. 
2. That later in the season the moisture spreads from the 
centre as shown by the low moisture-percentage of the heart-wood 
in February (Plate CLXXXVII). 
3. That the movement is much slower than in the case of Acer 
or Ulmus and also that the storage is apparently on a much 
smaller scale as evidenced by the lower range of percentages. 
IV. Coniferae (Plates CLXXXI, CLXXXVIII-CLXXXIX). 
Amongst the Conifers the deciduous and evergreen habit ap- 
parently makes no difference with regard to moisture-spread, 
but there is a very great difference between the resinous and 
non-resinous genera. 
f the resinous trees, species of Pinus, Larix, Chamaecypans 
and Cedrus have been examined and in no case is there storage of 
moisture in the heart-wood.* The impregnation of the walls 
with resin renders the passage of moisture from the sap-wood to 
the heart-wood impossible. Hence we have in these resinous 
trees throughout the year a condition approximating to the 
August Acer, i.e. in mature trees a large dry heart-wood area 
surrounded by the narrow wet zone of sap-wood. 
A typical moisture distribution graph for a resinous Conifer is 
given on Plate CLXXXVIII (Chamaecyparis pisifera, felled 
and Oct. 1918). The sap-wood gives very high percentages and 
there is a very sudden drop on entering the heart-wood. 
* Ho. M, Oliphant (apud Sir Hugh Stewart in Trans. Roy. Bot. Scot. Arb. 
vol. x . 67) that a comparison may be drawn between 
the eonal + moistare ea s of Picea sitchensis vine Acer Pseudoplatanus. 
ons cai one one cannot et et e moi 
distribution in the. pisses to which these tie species belong. Of the neybeal 
—— of resinous age examined at different wires none with central 
storag comparable wi hh that of Acer has been found. There } here 
and “there a slight ‘sen in moisture-percentage towards - at the centre of 
hea: n 
-wood but so slight and at times so inconstant as to a 
ed withthe central storage condition of Acer. 
