C. 3a.

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PLATE 2. Cboss-seotions of Wood.

Fig. I. —Cross-sections of Corsican Pine. Sap-stain did not develop seriously until after three months of summer weather. The section is typical of the sap-stain at three months, the left-hand of sap-stain at five months.

Fig. II.—Cross-sections of Austrian Pine (Pinus austriaca). Sap-stain at three months was slight, as shown in left-hand section. After three months the sap-stain developed rapidly, as shown in the right-hand section.

Fig. III.—Cross-sections of European Larch (Larix europea). Slight darkenings of outer sapwood zone indicate slight sap-stain.