413 
much more than half as much, their moisture contents being 
now 78 per cent. The canariensis blocks carried only 55 per 
series of measurements the curves shown in fig. 3 have been 
plotted, showing the relation between the moisture contents, 
as expressed in percentage of the dry weights, and the 
yer c expressed as percentages of the diameter of the dry 
ock. 
A n as the blocks were taken out of the water they 
at once started to dry out and decrease in weight, but, curi- 
or expansion of the wood is due to a change in the moisture — 
contents of the cell walls. An alteration of the amount of free 
water within the cells will of itself produce no effect on the 
