Photo-Mechl. Dept., Thomason College, Roorkee. 
Degree of penetration into the wood of a and b Pmus longifolia, and 
c and d. Pinus excelsa (i) immersed in, (ii) painted over with 
Avenarius carbolineum. 
[To face page 57. 
Pearson—Antiseptic Treatment of Timber. 
PLATE IV 
