444 EXPERIMENT STATION EECOED. 



The succeeding chapters deal with the chemical composition and adulteration 

 of manna and methods for analyzing manna. The paper concludes with a 

 bibliography of the subject. 



Memorandum, on the oil value of somfe sandalwoods from Madras, P. 

 Singh {[Indian] Forest Bui. 6 {1911), pp. It). — ^Analyses were made of 15 

 different specimens of sandalwood fi'om trees growing on different liinds of soil. 

 The results obtained appear to confirm the popular belief that the wood of 

 sandal trees growing in dry, rocljy, mountainous soil is richer in oil than that 

 of the trees found in the more fertile soils of the plains. 



A further note on the oil value of some sandalwoods from Madras, P. 

 Singh {Indian Forester, 41 {1915), No. If, pp. 12.3-131). — In continuation of the 

 above noted work, analyses were made of 44 samples of roots and stems of 

 sandalwoods collected from different localities with special reference to varia- 

 tion in oil content. 



The results of these analyses, as here presented, indicate that neither eleva- 

 tion, age, nor locality has any definite relation to the oil content of the wood. 

 The only factor which appears to affect the percentage of oil is the soil. This 

 conclusion confirms the previous findings that the trees growing in compara- 

 tively good, fertile soil yield heartwood poorer in essential oil than those grow- 

 ing in poor, rocky, gravelly soil. 



Prevention of decay in mill timbers, F. J. Hoxie {Trans. Nat. Assoc. Cotton 

 Manfrs., No. 96 {1914), pp. 270-292, figs. 8).— A paper on this subject, with a 

 discussion following in which attention is called to the increasing prevalence of 

 dry rot and other fungus troubles in mill timbers after construction. This is 

 believed to be due largely to the substitution of inferior grades of timber. 



The author concludes that specifications for hard pine mill timber based on 

 physics and chemistry are needed in place of the present botanical names which 

 have little significance. Density and resin are suggested as indices of good 

 qualities. Of the several antiseptic treatments which have a record over years 

 of practical service kyanizing with corrosive sublimate appears to be best 

 adapted to mill timber. Other newer materials, such as the fluorin compounds, 

 give promise of usefulness but have not been submitted to long practical tests. 



DISEASES OF PLANTS. 



Report of the phytopathological institute at Wageningen, 1912, J. Ritzema 

 Bos {Meded. Rijks Iloogere Land, Tuiti en Boschbouwsch. [Waffeningen], 7 

 {1914), No. 2-S, pp. 25-100, pi. i).— This report deals with the activities of the 

 institute during 1912 in connection with plant injuries of inorganic source as 

 well as those caused by bacteria, fungi, etc., also injuries due to animals or of 

 undetermined causation. 



Report of the botanical laboratory and laboratory for plant diseases, L. LiNS- 

 BAUER, F. ZwEXGELT, and H. ZuDERELL {Programm «. Jahresher. K. K. Eoh. Lchranst. 

 Wein ic. Ohsthau Elosternculmrg, 1913-14, PP- 162-186, pi. 1, figs. 3).— This 

 report includes information obtained during 1913 regarding diseases of pomace- 

 ous and stone fruits, grapes, and berry crops, and also on soil infection by plant 

 and animal micro-organisms in the vicinity. 



Notes are given on the reaction of plant cells to plant lice. 



[Plant diseases in Mauritius], F. A. Stockdale (In Summary of Investiga- 

 tions Made during the Period July 1 to Novemher 30, 1914- Mauritius: Drpt. 

 Agr., 1914, pp. 1, 2). — Among sugar cane diseases, deterioration of the white 

 Tanna variety was ascribed to a bacterium of a species as yet undetermined. 

 Red rot {Collctotrichum falcatum) is again reported, from a locality in a dis- 

 trict previously affected, attacking the white and striped Tanna varieties only. 



