144 Chemisches, Pharmaceutisches. 



locality. Free normal butyric acid was fouiid in the succinate deposit, 

 this was separated and determined by its barium salt; no other 

 volatile acid could be detected. It is evident that the succinic acid 

 is derived from the butyric acid by natural oxidation, and it then 

 probably forms the basic salt with the aluminium in Solution. Inves- 

 tigation was made of the ash of Grevillea rohusta, of G. Hüliana, 

 and of G. striata but no alumina could be detected in either, so that 

 the Statement previously made (Pr^ceedings 1895), that aluminium 

 succinate occurred in the timber of Grevillea rohusta was evidently 

 made in error, and it is probable that the tree from which that 

 deposit was obtained was Orites excelsa. When portions of the wood 

 of the Queensland sample were ignited , it was possible to obtain 

 the characteristic cobalt-blue colour for alumina when the ash was 

 moistened with cobalt nitrate and ignited, the other salts being too 

 small in amount to interfere with the reaction. Autorreferat. 



Smith, H. G., On the occurence of Calcium Oxalate in the 

 barks of the Eucalypts. (Proc. Roy. Soc. N. S. Wales. Decem- 

 ber 1905). 



The author announces the presence, in large quantities, of cal- 

 cium Oxalate in the barks of several species of Eucalyptus. It is 

 similar in form and appearance in all species, being well defined 

 monoclinic crystals in stout microscopic prisms, averaging 0.0174 mm. 

 in length, and 0.0077 mm. in breadth and containing one molecule 

 of water. A peculiarity of these is the tendency to form twins geni- 

 culate in appearance; twinned forms being pronounced in some 

 species. From botanical and chemical evidence it is assumed that 

 Eucalyptus salmonophloia wf West Australia and E. oleosa of 

 New South Wales belong to the same species, and that the latter 

 tree, which most offen occurs as a "Mallee," is only the degenerate 

 stage of the former. The theory is advanced that some of the "mal- 

 lees," or shrubby Eucalypts, have been formed through the poisoning 

 effect of the excess of oxalic acid, acting for a long time upon species 

 which originally grew as large trees. The tannins in those Eucalyptus 

 barks containing a large amount of calcium Oxalate are of very good 

 quality, light in colour, astringent, easily soluble, and should make 

 leather of good quality. On evaporating the extract to drjmess on 

 'the water bath but little darkening takes place, and the product is 

 still readily soluble. This class of Eucalyptus barks should, therefore, 

 make excellent tanning extracts. From the bark residue the calcium 

 Oxalate should be profitably extracted, and the oxalic acid obtained 

 cheaply from this, practically as a by-product. The air dried bark of 

 Eucalyptus salubris, the "Gimlet" of West Australia, gives 30.5% 

 of total extract and 18.6% of tannin absorbed by hide powder, and 

 contains 16% of calcium Oxalate. The bark of Eucalyptus gracilis 

 contains 16.660/„ of calcium Oxalate; that of E. Behriana 16.5"/o; of 

 E. oleosa IO.640/0; of E. dumosa 9.8%; and o{ E. salmonophloia 8.34%. 

 The barks of all the Eucalypts tested contain calcium Oxalate, although 

 in some species in very small amount Autorreferat. 



Ausgeo-ehen : S. Ifebruar lOOT". 



Verlag von Gustav Fischer in Jena. 

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