6 ILLUSTRATIONS. 



Page. 

 FIG. 24. Boiling point, specific gravity, and index of refraction curves for 



"hearts" obtained in refining of crude turpentine No. 1 36 



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



"tails " obtained in refining of crude turpentine No. 1 37 



26. Boiling point, specific gravity, and index of refraction curves for crude 



turpentine No. 2 38 



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



"heads" obtained in refining of crude turpentine No. 2 38 



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



"hearts " obtained in refining of crude turpentine No. 2 39 



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



"tails " obtained in refining crude turpentine No. 2 39 



30. Boiling point, specific gravity, and index of refraction curves for crude 



turpentine No. 3, untreated 40 



31. Boiling point, specific gravity, and index of refraction curves for crude 



turpentine No. 3, after treatment with caustic soda solution 41 



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



"heads" obtained in refining of crude turpentine No. 3 42 



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



"hearts" obtained in refining of crude turpentine No. 3 42 



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



"tails " obtained in refining of crude turpentine No. 3 43 



35. Boiling point, specific gravity, and index of refraction curves for crude 



turpentine No. 4 44 



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



"heads" obtained in refining of crude turpentine No. 4 44 



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



"hearts" obtained in refining of crude turpentine No. 4 45 



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



"tails" obtained in refining of crude turpentine No. 4 45 



39. Boiling point, specific gravity, and index of refraction curves for a 



commercial wood turpentine (Crude No. 4) refined in an ordinary 



pot still 46 



40. Boiling point, specific gravity, and index of refraction curves for com- 



mercial pine oil refined in an ordinary pot still 46 



41. Boiling point, specific gravity, and index of refraction curves for crude 



turpentine No. 5 47 



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



"heads " obtained in refining of crude turpentine No. 5 47 



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



"hearts " obtained in refining of crude turpentine No. 5 48 



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



"tails " obtained in refining of crude turpentine No. 5 48 



45. Boiling point and specific gravity curves for turpentine obtained in 



commercial refining of crude turpentine No. 5 49 



46. Boiling point and specific gravity curves for pine oil obtained in com- 



mercial refining of crude turpentine No. 5 50 



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



turpentine obtained from crude No. 1 analyzed after six months 56 



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



turpenine obtained from crude No. 2 analyzed after nine months. . 56 



