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334 
Journal oj Agricultural Research 
Vol. XXX, No. 4 
Fig. 2.— Diagram showing time elapsing between inoculation and the appearance of damping-off 
in Pinus resinosa seedlings. The percentage of seedlings damped-off each day is based upon the 
number of seedlings living at the end of the preceding day. The solid line-indicates that 
rice mush was used as the substratum for the inoculum; the broken line.indicates that 
corn-meal agar inoculum was used. Only those experiments are reported in which both kinds of 
inoculum were tested simultaneously. The standard fungi whose effect is shown in graphs 3, 
10,13, and 16 are those lines used in all tests for the sake of comparison; the results with these 
are not included in the other graphs. The following graphs represent results with more than 
one line: No. 1, 2 lines; No. 2,7; No. 4, 3; No. 6, 3; No. 6, 4; No. 7, 2; No. 8,6; No. 9, 10; No. 
11 , 8; No. 12, 8; No. 14, 5; No. 15,11; No. 16, 2; No. 17, 26. Each of the ordinary lines, with 
some unimportant exceptions, was tested on 20 seedlings with each kind of inoculum and the 
standard lines (except Gibberella) on 130 or more seedlings on each inoculum. The controls 
included approximately 1,000 seedlings on each inoculum 
