Floristik etc. — Pflanzenchemie. 251 



wie näher ausgeführt wird, aus der Untersuchung der Originalexera- 

 plare im Reichsmuseum zu Stockholm und aus der Prüfung der 

 in Bot. Not. gegebenen Beschreibungen hervor. 



Matouschek (Wien). 



Maiden, T. H., Notes on Eucalypts (with descriptions of 

 new species). N<^ IV. (Journ. and Proc. Roy. Soc. New South 

 Wales. IL. 3. p. 309—331. 1916.) 



The new species described are E. Dundasi, E. Sheathiana, E. 

 Websterianttj E. Flocktoniae, E. conßuens, E. Houseana. Critical 

 notes on several other species are also given. E. M. Cotton. 



Okuda, Y. and P. Eto, On the form of iodine in marine 

 algae. (Journ. Coli. Agr. imp. Univ. Tokyo. V. 4. p. 341— 353. 



1916.) 



The existence of somewhat remarkable quantities of iodine in 

 some marine algae is a matter of importance both from the physio- 

 logical and the technical point of view, but as to the form of this 

 iodine there exist only a few investigations. The writers have ascer- 

 tained the form of iodine to be chiefly organic, and have moreover, 

 made some further experiments with following species: Ecklonia 

 Cava, E. bicyclis {Eisenia arborea f. bicyclis)^ Turbinaria fusiformis, 

 Sargass74-m enerve and 5. horneri. 



The writers own summary and conclusions run as follows: 



Most of the iodine in all the algae examined is in organic com- 

 bination, as Eschle concluded. These fresh algae contain neither 

 iodate nor periodate, but trace or a very small quantity of iodide. 



The Chief organic iodine Compound is soluble in water, concen- 

 trated alcohol, dilute alkali or acid Solution. It differs'from aprotein. 



The distribution of iodine in Ecklonia bicyclis is shown, for the 

 sake of simplicity, in the following round numbers: total iodine as 

 100: a, inorganic (soluble) under 50/0, b. organic 95 0/q. From this 

 organic part, total 95: a. insoluble (protein?) 50/0, soluble 90 ^/q, viz. 

 protein (?) 50/0 and non-protein (chief iodine) 85 o/q. 



About 95 per cent of the iodine in „Dashikombu" prepared 

 from Lantinaria is in an inorganic form, as Tsukamoto and Furu- 

 kawa found, but the w^riters presume that the chief form of iodine 

 in fresh Laminaria will be organic. 



Ecklonia bicyclis has no enzyme which splits the organic iodine 

 Compound. The Compound undergoes gradual disintegration by some 

 microorganisons. 



Dilute Solutions of sodium Chloride, calcium Chloride and hydro- 

 choric acid have a strong effect on the decomposition of the iodine 

 Compound, and Chloroform also has some influence. 



Dilute Solutions of sulphuric acid and sodium hydroxide have 

 no effect upon the iodine Compound of Ecklonia bicyclis, but the 

 concentrated Solutions decompose it completely. 



When Ecklonia bicyclis is heated with formalin, its iodine not 

 only changes the form, but also decreases the quantity. 



The organic iodine of Ecklonia bicyclis is not decomposed by 

 nascent hydrogen and is not precipitated by phosphotungstic acid 

 (in distinction from iodogorgonic acid and iodothyrine). 



Old algae contain more iodine than the young. Total iodine of 

 Ecklonia bicyclis increased from winter to summer as follows: De. 



