264 Holmes. — A Contribution to the Study of 
resistance of the wider vessels. The final result in this series, that is, the 
specific conductivity in its transverse aspect, is indicated in Curves C, 
Fig. 5. The percentage of B in A in each separate annual ring shows less 
variation as the line is traced backwards ; there is a general tendency 
towards a lower specific conductivity in the lower part of the stem. It is 
sufficiently evident from the diagrams that the maximum values for C occur 
in first-year wood. The range of values observed for C in the wood of ! 
separate annual rings, apart from first-year wood, is 5-05 to 12-42 per cent. 
Statistics for the wood as a whole. Professor Farmer’s figures for 
specific conductivity (5) for shoots of various ages are worked out on the 
basis of the sectional area of the whole of the wood present. With these 
may be compared as far as practicable the values plotted out in Figs. 2, 3, 
6, 7, 8, 9, 10, 12, and 13, to indicate the condition of each factor at the end 
