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IN VEGETABLE BIOLOGY. 



525 









these strictures Wiesner * has replied, hut without materially 

 advancing the theory. 



Is some such substance present in £ allia-stoppers ? Bearing 

 m mind the identity in proteid-reactions shown by stoppers and 

 protoplasm (omitting, of course, the brighter colour with Millon's 

 fluid taken by the stoppers) , one is inclined to say no. In order to 

 decide the question, however, experiments have been made with 

 uids in which the non-proteid substances giving Millon's reaction 







are soluble. 



It may be premised that Phloroglucin cannot be present, for 

 hydrochloric Acid gives no red colour to the stoppers. Of the 

 bodies that remain, Nitrobenzole, Phenol, Thymol, and .Naphthol 

 are readily soluble in alcohol and ether. Accordingly pieces of 

 Pallia were allowed to lie in strong alcohol for 36 hours, and, on 

 now testing with Millon's fluid, the bright red colour was at once 

 g°t. As for Tyrosin, it is soluble in acid and alkaline solutions j 

 hut on testing with Millon's fluid after 36 hours' action of a strong 

 solution of Hy droch loric Acid, the red colour was easily yielded. 

 Vanillin is soluble in water ; 90-100 parts are required at 14°, 

 and 20 parts at 75°-80° + ; but on soaking Ballia-vl&ntB in water 

 tor three days and afterwards boiling for five minutes, Millon's 

 reaction was as readily obtained as ever. There remains the small 

 and obscure group of aromatic oxyacids ; but I cannot see the 

 lightest chance of the proteid reactions of the stoppers being due 

 to them. 

















































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{.Supplementary Note to Memoir on Apiocystis Brauniana, Mg 

 »» Journ. Linn. Soc. Bot. xxv. 



■In the 



(1890). 

 memoir on Apiocystis a few notices of the distribution of this 

 alga escaped 



elaborate 



me. 



On referring to the recently issued and 



1889) 



appears that Apiocystis has been found in Sweden, Bussia, Bohemia, 

 ^d in the United States. There is also a paper in the «Anuales des 

 Sciences Naturelles ' (ser. 7, tome vii. p. 1< 



8) by M 









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Ber. d. deutsL-h. hot ttftsfillsch. 1888 



also Krasser 



1888. 



Centralb! 





xxxrii ) and Krabbe ( Pringsbeim's Jahrb. f. wiss. Bot 



| 



istry/ vol. iii. part 4, p. 354. 



xvi «. pp. 352-354) write against Wiesne r 9 '^ ' 



t Roscoe and Schorlemmer. * Treatise 





















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