Bui. 1 19, Forest Service, U. S. Dept. of Agriculture. PLATE I. 



FIG. 1. RESIN CRYSTALS FROM PINUS SABINIANA; FORMED 

 BY RAPIDLY CRYSTALLIZING, FROM ALCOHOL AND HYDRO- 

 CHLORIC ACID, THE RESIN ACIDS OBTAINED FROM THE 

 ORIGINAL OLEORESIN. 



FIG. 2. RESIN CRYSTALS FROM PINUS SABINIANA; FORMED 

 BY CRYSTALLIZING, FROM ACETONE, THE PRODUCT OB- 

 TAINED BY DISTILLING THE ROSIN UNDER REDUCED PRES- 

 SURE. 



