44 MISSOURI BOTANICAL GARDEN. 
softer powder has worn away the grooved boards have a 
singular appearance. 
From such data it may safely be said that the disintegra- 
tion never goes beyond a certain stage. When a tree is 
cut down the further progress of the disease is stopped. 
No tree, as far as is known, has been seen in which all the 
wood had been destroyed, and it is for this reason that a 
diseased tree remains standing even when much decayed. 
STRENGTH OF CypRESS Woop. 
A number of tests were made to determine the relative 
crushing strength of sound cypress wood and that of very 
pecky wood.* In making these tests blocks cut from the 
heartwood were used. These were dried in a kiln for three 
days and were tested immediately after being taken from 
the drying oven. The tests were made with the machinery 
used for the timber tests of the U.S. Division of Forestry. t 
A full description of the same will be found in the bulletin 
referred to. 
CRUSHING STRENGTH (ENDWISE), OF SOUND CYPRESS. (HEARTWOOD. ) 
Dimen- Breaking 
sions of | Height. Po — load per Raiiey. 
block. | Inches, | 2@4re oad. square 
Inches inches. | Pounds. inch. 
Pounds. 
1 |1.82%1.80| 3.24 ETL 12,300 7,191 |From Lutcher, La. 
1.69X1.27| 3.28 2.14 15,490 7,144 “ “ “ 
1.55<1.29| 3.00 1.99 14,250 7,160 “ “ “ 
o wo 
* In making these tests I am much indebted to Mr. W. H. Henby for 
material assistance. 
t Timber physics. Pt. I. (Bull. U. S. Div, of Forestry 6: 31.) 
Washington. 1892. 
22 
