Some Common Hardwoods. 



407 



one had the radial faces left clean, one the tangential faces and. 

 one the cross section faces clean. In waxing them, the paraffin. 

 Avas heated to just above boiling point of water and then the face 

 of the cube was brought into contact with the surface of the 

 jiarathn. When the paraffin set the process was repeated. This 

 gave a very satisfactory result. In all the sets made the cubes 

 which had the cross section faces left clean dried almost as quickly 

 as the culje which had no paraffined faces. This is due to the- 

 vessels being small tubes running through the cube and therefore- 

 increasing the evaporating surface. This rapid drying from the- 

 ends does not extend far up the length, as will be shown later. 

 It explains why logs left exposed to the sun split so badly at the- 

 ends. 



July Aug Sept Oct 



Fig. VI. 



Fig. VI. gives a typical series of curves for the drying of tlie- 

 cubes bv the various faces. 



