EVALUATION OF WOOD PRESERVATIVES 



475 



100 



30 40 50 



TOTAL CREOSOTE LOSS 



60 70 



N PER CENT 



Fig. 31 — Theoretical relation of the per cent increases in the residue above 

 355°C and the per cent losses of total creosote. 



which the fraction below 355°C is the solvent and the fraction above 

 355°C is the solute; and that this condition does not hold for any other 

 temperature point. 



Let it be assumed that one may dodge the inferences of the results 

 obtained by Hudson and Baechler^^ about the increase that may occur 

 in the residue above 35o°C as a result of oxidation. Here one would be 

 in agreement with Schmitz et al.^^^ ^'^^^ Let it be assumed further that 

 all loss takes place in the fraction below 35o°C, and that the residue 

 above 35o°C is inert, (cf. Loseby and Krogh^^). The residue in the eight 

 creosotes used by Bo\dng would increase in their appropriate ratios to 

 the figures sho^\Ti for seven and fourteen days in Table XXXI. Losses 

 for creosotes of different initial residues and consequent residue increases 

 can then be represented by a family of curves for residue increase with 



L 



