ILLUSTRATIONS. 7 



FIG. 49. Boiling point, specific gravity, and index of refraction curves for 1h<> 



turpentine obtained from crude No. 3 analyzed after nine months. . 57 



50. Boiling point, specific gravity, and index of refraction curves for the 



turpentine obtained from crude No. 4 analyzed after nine months. . 57 



51. Boiling point, specific gravity, and index of refraction curves for the 



turpentine obtained from crude No. 4 analyzed after three months. . 58 



52. Boiling point, specific gravity, and index of refraction curves for the 



turpentine obtained from crude No. 5 analyzed after six months 58 



53. Boiling point, specific gravity, and index of refraction curves for tfie 



turpentine obtained from crude No. 5 analyzed after ten months.. 59 



54. Boiling point, specific gravity, and index of refraction curves for tur- 



pentine obtained from crude No. 5 after redistillation 59 



