259 
Water-conductivity in Sycamore Wood. 
characters A to G, in each category ; the thirty lines A to F of the first 
category are set out in Figs. 4 and 5, while the thirty-five lines A to G of the 
second group appear in Figs. 6 , 7, and 8. There is, of course, only one set 
of G lines, and each pair of corresponding lines from the two groups has 
a common ending in the one-year part of its course. In the cases of S2 and 
S4, each three-year-old specimens, the twenty-one lines have been drawn for 
the wood as a whole at the end of each year, in Figs. % and 3, and Figs. 9 
and 10. The other lines are not given, except for B and F, and these 
additional portions, giving values for the annual rings taken separately, are 
inserted into the same diagrams for comparison. In the case of S5, the 
statistics for three of the one-year-old laterals are indicated in Fig. 11, 
while the lines for the main stem of the whole two-year plant, ending in the 
uppermost, and very unequal, pair of branches taken together as a leader, 
are given in Figs. 12 and 13. These include the lines of both categories ; 
they are distinguished by the insertion of dates, the numbers referring 
to the years in which the wood was developed. 
Results. 
It will be convenient, in discussing the significance of these observations, 
to begin with the simpler parts which have reference to first-year wood, and 
afterwards to consider the whole series in the two categories mentioned above. 
Wood of the first year. It will be seen that a general similarity 
in direction exists in the curves constructed for first-year wood in the three 
plants. Curve A, giving in sq. mm. the area of the wood in transverse sec- 
tion at the middle of each internode, shows a gradual decline from base to 
