Some Common Harchvoods. 



but none of these justifies this end stacking. Lengths of 4 in. r 

 2 in. Mountain, Ash were cut into sets of IJ in., 3 in., 6 in. 1 ft., 

 2 ft., 4 ft. Four of these sets were made. Tlie sides of the timber 

 were paraffined so as to prevent all lateral evaporation, but the- 

 ends were left open. Two sets were placed vertically and two sets- 

 were laid horizontally. The vertical sets ought to have dried the 

 more quickly, but this Avas not so. All four sets dried at about 

 the same rate, the reason being that the moisture is lost by diffu- 

 sion. The following graph shows the rates at which each length 

 was drying. 



7i a? 17 d 



June 



26 15 

 July Aug Sept 



Fig. V. 



Corresponding pieces which were not paraffined dried much more 

 rapidly, showing that the loss of moiisture is from tJie sides, not 

 from the end of the timl>er. The theory of end drying was further 

 tested b}- cutting a 10 ft. of E. goniocalyi into 2 5-fts., one being 

 placed vertically and the other horizontally, the latter one reatinp: 



