Oct., 1923] SNELL — EFFECT OF HEAT & UPON FUNGI 407 
Table 2. The effect of moist heat upon the mycelium of Lenzites sepiaria, L. trabea, Trametes 
serialis, T. carnea, and Lentinus lepideus within f- by f- by i-inch Sitka-spruce blocks 
Hours 
Temperature (degrees C.) 
44 
46 
48 
SO 
52 
55 
Lenzites sepiaria . 
12 
+ 
+ 
— 
- 
+ + 
- 
36 
— 
— 
48 
— 
— 
60 
— 
72 
— 
Lenzites trabea . 
12 
+ 
+ 
+ - 
+ 
+ - 
_ 
24 
+ 
+ + 
+ - 
— 
+ - 
— 
36 
+ 
+ 
— 
— 
— 
48 
+ 
— 
— 
— 
— 
60 
+ 
— 
72 
+ 
— 
Lenzites serialis . 
12 
+ - 
- 
— 
_ 
— 
— 
24 
+ 
+ + + 
— 
— 
— 
36 
+ 
— 
— 
48 
— 
— 
60 
— 
72 
— 
Trametes carnea . 
12 
+ 
+ 
+ - 
— 
+ -- 
— 
24 
+ 
+ 
+ “ 
— 
— 
36 
+ - 
— 
— 
48 
+ 
— 
— 
60 
— 
— 
— 
72 
— 
— 
— 
Lentinus lepideus . 
12 
+ 
+ + 
+ + + 
+ 
+ + + 
— 
24 
+ 
+ - 
— 
— 
+ + - 
— 
36 
+ 
— 
+- 
— 
48 
+ - 
— 
-- — 
— 
60 
+ 
— 
— 
— 
72 
+ “ 
— 
— 
time during which the moisture content of the wood was above the fiber- 
saturation point. It may be seen that it would not take very long periods 
at temperatures from 45 0 C. upward, with the wood at fiber saturation 
(moist heat), to kill all mycelium. Green hardwoods are usually under 
these conditions long enough to be sterilized within. Preliminary steaming 
treatments would have the same effect. 
In the controlled-humidity type of kiln, the same should hold true. An 
analysis was made of the curves given by Tiemann (8, Pis. I-VII) which 
show the conditions operating upon different kinds of i-inch lumber in a 
typical run of this type of kiln (table 3). For our purposes here and for 
comparison with the data presented in this paper, the possibility of killing 
mycelium in wood in such a kiln may be calculated in two ways: (1) on the 
basis of dry heat acting over the entire period of the run at the varying 
temperatures, and (2) on the basis of moist heat acting from the beginning of 
