Floristik, Geographie, S3'Stematik etc. 663 



and the phosphoric acid method gave 53 per cent. ot" that constituent 

 in the crude oil. The specific gravity of the crude oil at 15° C. was 

 0-9134; the refractive index 1-4665 at 23° C. , and the rotation in a 

 100 mm. tube was -f- 2-1°. The figures for the rectified oil differed 

 but slightly, onlj' a small amount of ester was found, the saponifi- 

 cation number being 3*1, but the esterised oil gave a saponification 

 number 336, showing that alcoholic bodies were present. The solu- 

 bility in alcohol, with the crude oil, showed a peculiar reaction. 

 which did not occur in the rectified oil. The comparative absence of 

 high boiling constituents in the oil of this species accounts for the 

 somewhat low specific gravity, and for this reason it could not 

 replace oil of Cajuput while the Standard remains as at present, 

 although it would be difficult to prevent its use as Eucalyptus oil 

 belonging to the eucalyptol class. 



M. Ibiariifolia Sm. , the second species investigated , is one of 

 the tallest of the "Tea Trees,'' and has a more extensive ränge than 

 the former. It has narrow linear leaves, about an inch and a half 

 long, whilst those of M. thyniifolia Sm. , measure only a few lines 

 in length. The histology of the leaf is investigated, and its structure 

 is shown to more nearly resemble that of a Eucalyptus than its 

 congener here described. The j^ield of oil from the leaves and branch- 

 lets of this species was 1-214 per cent. The qualit>' of the oil cannot 

 be compared with that of M. thyniifolia , as the cineol content in the 

 crude oil was onl}- 16 per cent. The specific gravity of the crude 

 oil was 0-9129, the refractive index 1-4741 at 22° C. and the rotation 

 in a 100 mm. tube was -|- 2-5. The sesquiterpene present resembled 

 most markedh' that obtained from the Eucalypts, and its presence 

 accounts parth' for the higher refractive index. The rectified oil was 

 colourless. The ci-ude oil was insoluble in 10 volumes 70 per cent. 

 alcohol. Autorreferat. 



Correvon, Henry, Nos arbres. (Geneve et Paris. 305 pp. Gr. 8^ 



1906.; 



Der unermütliche Vorkämpfer für Pflanzenschutz, der Presi- 

 dent der „Societe pour la protection des plantes" hat hier in seiner 

 enthusiastischen Weise eine Lanze eingelegt für die Erhaltung schö- 

 ner einheimischer und cultivirter Bäume. Das Buch ist gut 

 geschrieben und mit zahlreichen, z.T. ganz vortreflichen Illustrationen 

 geschmückt. Es behandelt im ersten Teil die historischen Bäume, die 

 Wälder, die Geschichte der Entwaldungen und der Aufforstungen in 

 der Schweiz und ihren Nachbarländern; der zweite Teil bespricht im 

 Einzelnen die Bäume der Wälder, Parke und Alleen der Schweiz. 



C. Schröter (Zürich.) 



Felber. Theodor, Natur und Kunst im Walde. Vorschläge 

 zur \"erbindung der Forstaesthetik mit rationeller Forst- 

 wirtschaft. Für Freunde des Waldes und des Heimat- 

 schutzes. (Frauenfeld. 135 pp. gr. 8°. Mit 13 Textfiguren und 23 

 Vollbildern in Autotypie. 1906.) 



Der erste „vorbereitende"' Teil enthält Erläuterungen über Grund- 

 begriffe, Aesthetik, Stil, Natur.schönheit, Character der Waldbäume, 

 Wald Verschönerung und Forstkunst, Bedeutung der Waldverschö- 

 nerung, Stellung des Staates, der Gemeinden und der Privaten zu 

 derselben. 



