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 WOOD. 



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, f 

 A full description of the same will be found in the bulletin 

 referred to. 



CRUSHING STRENGTH (ENDWISE), OF SOUND CYPRESS. (HEARTWOOD,) 



* 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 



