ilO 



K T. Fatton 



It will be seen that there is a close relation between moisture- 

 content and resistance. To be of any value, further experiments- 

 are necessary with regard to the direction in which the resistance- 

 is measured, species of timber, density of specimen, etc. 



































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Percentage of moisture 

 Fig. VII. 



Structure. — Only a few notes on the structure of Mountain Ash' 

 will be given, as a comparative study of the structure of our- 

 timbers is being carried on. The outstanding feature is the sim- 

 plicity of its structure which in this respect is comparable to pine. 

 The most notable feature is the area given over to water conduc- 

 tion. The vessels are elliptical, the major axis being directed" 

 radially. The largest major axis recorded is 0.4 mm., and the 

 average works out at 0.2.5.3 mm. An interesting feature is the 

 distribution of the vessels over the annual ring. They are not 

 confined to the spring wood. A few experiments were made to 

 determine the lengths of the vessels by the mercury method. It: 



