382 Angewandte Botanik. 



Annett, H. E. and C. Kar Subodh. Amount of Copper in Tea 

 sprajj^ed with Bordeaux mixture. (Journ. Agric. Sc. III. 3. 

 p. 314—316. Sept. 1910.) 



The Chemical examination of sprayed tea was carried out in 

 connection with the experiments by Mc Rea referred to above. 

 Tea was manufactured from the experimental plots in the ordinary 

 way, and cn examination was found to contain half a grain of cop- 

 per per pound. A very small quantity was also found in unsprayed 

 tea namely ^^ grain per ft:. The amount of copper taken into ihe 

 s^'^stem from two litres of infused tea would be almost inappreciable. 

 The analytical methods emploj'-ed are described. 



A. D. Cotton (Kew). 



Hasterlik, A., Der Tafelsenf (Mostrich) und die technische 

 Verwertung der Senfpflanze. (Verlag A. Hartleben. 56 tig. ä 

 Taf. Wien und Leipzig 1910.) 



Alle Produkte, die aus Senfsamen gewonnen werden, beschreibt 

 der Verfasser. Geschichte des Senfes, Kultur und Anbau, chemische 

 Zusammensetzung des Samens. Gewinnung des fetten Senföles, 

 Darstellung und Verwertung des ätherischen Senföles. Statistische 

 Daten über die Preiswertung. Fabrikation der einzelnen Arten von 

 Tafelsenf. Hiezu nötige technische Hilfsmittel. Veränderungen des 

 Senfmehles und Mostrichs und die durch verderbten Mostrich ent- 

 stehenden Vergiftungen. Verfälschungen des Senfmehles und 

 Mostrich. Gesetzliche Bestimmungen für Senf für viele Länder. 

 Gerichtliche Streitfälle. Matouschek (Wien). 



Holm, T., Medicinal plants of North America. 44. Apocyman 

 cannabinumL. (Merck's Report XIX. p. 277—280. fig. 1 — 11. Oct.1910.) 



The drug '^Apocynum^^ U. S. is not, as officially described, the 

 rhizome, but the roots of A. cannabinum L. The species possesses 

 only a pseudo-rhizome, but a very extensive reproduction is secured 

 by means of root-shoots, developed from the long, horizontal roots,. 

 hence the populär name: "Wandering milkweed". The root has a 

 strong odor, and a nauseous, acrid, persistently bitter taste, it con- 

 tains apocynin and apocynei'n. It has proved a valuable cardiac 

 stimulant and diuretic, especially in cardiac dropsy, and also in 

 chronic Bright's disease. The fibrous bark of the stem affords a 

 substance for hemp, hence the name 'Tndian hemp". The species 

 is described and figured, as well as the internal structure. Unfor- 

 tunatel}^ the seedling-stage is not known, and the material examined 

 consisted exclusively in root-shoots; therefore it could not be deci- 

 ded, when the laticiferous ducts make their first appearance, whe- 

 ther in the primary tissues, or only in the secondary. In the mature 

 specimens these ducts were not observed in the thin lateral roots^ 

 nor in the thin secondar5^ but only in the old, very thick secon- 

 dary, where thej' are very abundant in the secondary cortex. In 

 the stem we find the ducts in the cortex as well as in the pith; the 

 mestome-strands are bicollateral, but this structure is in Apocynian 

 accompanied hy a true internal cambium, active and producing 

 new leptome as well as new hadrome i. e. libriform and porous- 

 tracheids. The remarkable structure was detected and described by 

 Hjalmar Nilsson in his "Dikotyla jordstammar (1882). In 

 regard to the cork, this is developed sometimes from epidermis, 

 and sometimes from hypodermal Stratum of cortex. While the pith, 



