258 



FORESTRY AND IRRIGATION. 



June, 



furnishes valuable data for the detec- 

 tion of adulteration. A method for the 

 determination of the solubility is de- 

 scribed. 



The Sesquiterpene of Eucalyptus Oils. 

 H. G. Smith (Chem. News, 85, 3). 

 The red coloration produced on testing 

 the oils for eucalyptoi with phosphoric 

 acid is due to a sesquiterpene which oc- 

 curs chiefly in oils boiling above 255 C. 

 The name "Aromadendrene " is pro- 

 posed. 



The Coloring Matters of Green Ebony 

 Wood. A. G. Perkin and S. H. C. 

 Briggs (Journ. Eond. Chem. Soc, 81, 

 210). Green ebony is a wood which 

 has been used in England until quite 

 recently, and is probably obtained from 

 Excoecaria glandulosa oxjacaranda ovali- 

 folia. It contains small quantities of 

 two crystalline coloring matters excoe- 

 carin CigHijOs and jacarandin ChHi^Oj. 

 The wood also contains two resins, one 

 of which is a yellow dyestuff, while the 

 other has no dyeing properties. 



The Occurrence of Tannin, Starch, 

 and Sugar in Acer pseudoplatanus in the 

 First Year of its Growth. J. Ham- 

 merle (Ber. deutsch. botan. Gesell., 19, 



538). 



The Adulteration of Turpentine with 

 ' ' White Spirit. ' ' A. and P. Andouard 

 (Journ. Pharni. Chim. (6) 15, 99). 



The ' ' white spirit ' ' had the following 

 properties : Specific gravity = 0.S17 at 

 15 C, (a) d = -i.2, initial boiling 

 point = 150 C, bluish fluorescence. 

 The residue at 205 C. amounted to 42 

 per cent of the original volume, had a 

 yellowish color, empyreumatic odor 

 resembling petroleum, and a slight levo- 

 rotation (-o.2). Turpentine adul- 

 terated with ' ' white spirit ' ' can be 

 recognized by the bluish fluorescence, 

 much decreased rotary power, change 

 in density, incomplete evaporation at 

 ordinary temperature, and increased 

 residue on distillation. The ' ' white 

 spirit ' ' is evidently not identical with 

 ordinary benzine. 



The Composition of Norwegian Wood 

 Tar. J. A. Mjoen (Zeitsch. angew. 

 Chem., 15, 97). Analyses of tar pre- 

 pared in retorts and in meilers, com- 

 parisons being made with Austrian 

 beechwood and Bohemian Pine Tar. 



The Action of Crystalline Arsenic 

 Acid on Pinene. P. Genoresse (Compt. 

 rend., 134,360). On heating 1,000 

 grams of pinene with 250 grams of 

 arsenic acid, using a reflux condenser, 

 about 60 per cent of terpinene with 

 small quantities of cymol and terpineol 

 are formed. The method can be tech- 

 nically applied to for the production of 

 terpinene. 



RECENT PUBLICATIONS. 



Practical Forestry for Beginners in Forestry, Agri- 

 cultural Students, and Woodland Owners. By 

 Dr.JOHN GiFFOKD. Illustrated. Pp.284. 

 Price, |i.2o net. D. Appleton & Co., 

 New York. 



A timely book on the subject of forestry is 

 Dr. John Gifford's "Practical Forestry," a 

 handsomely printed and illustrated volume 

 just received. The keynote of the book is 

 stated in the preface as follows : " In the fol- 

 lowing pages the author has endeavored to 

 include those parts of the science and art of 

 forestry which are of interest and importance 

 to tht general reader and beginner. ' ' 



Dr. Gifford has wisely decided that the aver- 

 age American needs to be educated up to a 

 clear understanding of the meaning and aim 

 of forestry. With this idea in view he has 

 written a book that contains a good general 

 ''description of what forestry is, with just enough 

 technical information to prepare the beginner 



for the more intricate problems connected with 

 forest management. 



The book is divided into four parts. Part I 

 contains a chapter on the meaning of forestry, 

 one on farm woodlots, and then follows an ex- 

 tended description of the make-up of a typical 

 forest, the physical influence exerted by for- 

 ests, and the geographical distribution of for- 

 ests. Part II is devoted to a discussion of ' ' The 

 Formation and Tending of Forests," while in 

 Part III the "Industrial Importance of For- 

 ests " is noted, with descriptions of the various 

 industries and products of the forest. 



There is much vali:able information con- 

 tained in Part IV, where the principal federal 

 and state forest reservations are noted. This 

 part also contains a list, with a short descrip- 

 tion of each, of fifty American forest trees, 

 including twenty-five conifers and twenty-five 

 hardwoods. 



Dr. Gifford's wide experience as a teacher, 



