[ГУог. 4 
142 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
SERIES C 
For this series blocks of yellow poplar (Liriodendron tulipi- 
fera) were cut the same size as for the cultures of series A 
and B. They were all taken from the same piece of sap-wood 
and were all of approximately the same specific gravity. They 
were dried to constant weight at 65° C. and weighed. Twelve 
dilutions of resin in benzol were prepared, containing from 
0 to 10 per cent resin. Seven of the blocks were immersed in 
each of these resin solutions, which were heated to boiling to 
drive the air out of the blocks. When the solution had cooled 
it was driven into the blocks, impregnating them with various 
amounts of resin. The blocks were then removed to an elec- 
tric oven where they remained at room temperature for sev- 
eral hours, while a greater part of the benzol evaporated, | 
after which they were dried at 65° C. and weighed. Control 
blocks without resin were also used and all were placed in 
cultures as described for series A. All were inoculated with 
Lenzites saepiaria and were incubated for one year. 
TABLE же (Series С) 
DECAY OF RESIN- — € ELLOW POPLAR BLOCKS INDUCED BY 
084 ЅАЕРІАКІА 
Weight Weight Per cent 
ри before decay after decay loss in dew 
Е gm.) (gm.) weight 
O 1 12.093 7.894 34.70 к. 
О 7 360 2.777 13.95 “ 
O € 636 10.916 13.60 ( 
O 4 525 10.690 .25 #0 
о: 193 2.182 17.96 " 
O 6 .793 10.915 20.87 #0 
О 7 451 517 36.70 #0 
F 13.007 .276 36.40 0.87 
P3 [3.085 .012 38.8 0.74 
Р 9.636 161 46.5 0.27 
P 4 10.888 .009 E 0.27 
poi 0.236 6.692 4 0.03 
Р 6 827 451 38.70 0.17 
Е 581 .750 35.50 0.41 
Q 181 .706 33.0 0.88 
О : 710 .545 24.90 57 
o 1 785 765 - .60 .00 
Q 4 0.075 .226 3 0.50 
e .400 .675 23.90 0.43 
О 6 393 ‚845 22.40 0.54 
63-і 3.208 521 35.50 48 
221 3,153 .580 27.1 .29 
* Soaked in benzene without resin. 
