1S4 SEOTIONAt ADDRKSSfiS. 



Fourthly, that we need a mathematical theory for the strength of 

 anisotropic materials, of which timber is an extreme and important 

 example. 



"When the notes for this address were first drafted I ended by an 

 appeal to the Board of Scientific and Industrial Research to undertake 

 the necessary research work. Since then the Aeronautical Research 

 Committee has been constituted, and a sub-committee has been 

 appointed to deal with ' Materials.' I have great hopes that the 

 committee will tackle many of these problems. I will therefore conclude 

 by appealing to all who can help to assist that committee in their 

 endeavour to solve these most important and fascinating, but most 

 ditficult, problems. 



