Physiologie. — Algae. 645 



de l'association entre les cellules derivees d'un oeuf et les 

 filaments d'un parasite necessaire appartenant ä une espece 

 particuliere de Champignon. Paul Vuillemin. 



Hill, Arthur Croft, A contribution to the Chemistry 

 of Proteids. Part 2. The Constitution of trypto- 

 phane. The action of bacteria on it. (Hopkins-Yale. 

 Journal of Physiology. 29. 1903. p. 451.) 



From the researches pubHshed in Part I of this paper (Ibid. 

 27. 1901. 418) the authors conclude that the tryptophane for- 

 med during the action of pancreatic trypsin ofi proteids is 

 either indol-amido-propionic acid or skatol-amido-acetic acid. 

 The present investigation was directed to the determination of 

 the correct view. The authors determined the fact that the evil- 

 smelling products indol and skatol are derivatives of tryptophane 

 by inoculating sokitions of it with ordinary putrefactive bacteria, 

 it being soon possible to extract them both from the digestion. 

 The action of the Rauschbrand bacilkis and Bacteriiim coli 

 communis was to Mberate a very large percentage of skatoi- 

 acids but very little indol. From the results of the bacteria! 

 activity the authors have come to the conclusion that the trypto- 

 phane is the skatol Compound. Comparatory results were 

 obtained by fusing the substance with potash and by oxidising 

 it by means of fenic chloride. Reynolds Green, 



LOEW , Oskar , Unter welchen Bedingungen wirken 



Magnesium salze schädlich auf Pflanzen? (Flora. 



Bd. XCII. 1903. p. 489.) 



Verf. kommt im Anschluss an neuere Mittheiiungen anderer Autoren 

 auf seine Theorie von der Giftwirkung der Magnesiumsalze zurück. 



Küster. 



Schrader, Herman f., Observations on Alaria nana sp. 



n o v. (Minnesota Botanical Studies. Third Series. Part 11. 



july 3, 1903. p. 157— l(x5. pl. 23— 2b.) 



Alaria nana Schrader n. sp., is very fully described and figured 

 from plants collected at the Minnesota Seaside Station Van- 

 couver Island, British Columbia, in 1902. The published sum- 

 mary is as follows: 



1. Alaria nana is one of the smallest Alarlae known, mature plants 

 being seldom longer than 50 — 70 cm. 



2. At the Minnesota Seaside Station it is a surge plant, 

 belonging in the same group as Lessonia littoralis and Postelsia palmae- 

 Jornih. 



3. The holdfast does not show growth rings. 



4. The growth of the stipe in thickness is radial, and this difference 

 in growth and shape of the outer and inner cortex, caused by a cambial 

 layer, sometimes gives a ringed appearance to the stipe. Mucilage 

 ducts are not present; cryptostomata were found neither in stipe nor in 

 lamina. 



ö. The sori occur in large patches on both sides of gonidiophylls 

 pfoduced laterally on the stipe. The paraphyses have thick mucilagi- 

 nous Caps as in Lessonia and Pterygophora. William R. Maxon. 



