Physiologie. 377 



kegehalt der Kartoffel ist aber um 3^% kleiner, der Stickstoffgehalt 

 etwas vergrössert, in der Asche findet sich trotz der sulfatenhaltigen 

 Mist sehr wenig SO3. Jar. Stuchlik. 



Senft, E., Ueber die Funktion sog. Inklusen in der Radix 

 Liquiritiae. (Vestnik V. sjez, ces. pnr. p. 608. 1915. Böhmisch.) 



Autor bestätigt die Ansicht dass die sog. Inklusen in der Radix 

 Liquiritiae die Rolle des mechanischen Gewebes übernommen haben, 

 denn sie kommen hauptsächlich dort fort, wo wir gewöhnlich 

 mechanisches Gewebe finden. Ausserdem aber haben sie auch eine 

 biologische Funktion, denn sie dienen als Wasserbehälter für die 

 Trockenzeit. Und endlich vertreten sie die zerstörten Gewebe, al so 

 dienen sie als Heilstoff; sie bestehen aus Floroglykotannoiden und 

 können bis zu gewissem Grade auch antibakteriell wirken. 



Jar. Stuchlik. 



Schneider, E. C, A nutrition in vestigation on the inso- 

 luble carbohydrates or marc of the apple. (Amer. Journ. 

 Physiol. XXX. p. 258—270. 1912.) 



The work done by other investigators on various phases of the 

 subject is outlined more or less briefly under the foUowing heads: 

 The composition of the apple and its marc; bacteriological studies; 

 enzyme studies; digestion and utilization. His own findings in brief 

 are as follows: a pectin from the water insoluble portion, or marc, 

 of the apple gave on analysis about 57 0/0 of reducing sugar, as 

 dextrose, 34 o/^ pentosans, and 45 "/q galactans; faecal bacteria, both 

 aerobic and anaerobic, are capable of destroying the hemicelluloses 

 of marc, pectin. and the pentosan and galactan of the pectin, but 

 the enzymes tried were not capable of hydrolyzing either marc or 

 its pectin; while weak acids split off pectin and reducing sugars 

 from the marc ; human subjects digested or destroyed about 80 % 

 of the marc hemicelluloses; this was accounted for by bacterial 

 action. M. C. Merrill (St. Louis). 



Sehreiner, O. and J. J. Skinner. Experimental stud}^ of 

 the effect of some nitrogenous soil constituents on 

 growth. Nucleic acid and its decomposition products. 

 (Plant World. XVI. p. 45-60. 1913.) 



Nucleic acid, as well as the purin bases hypoxanthin, xanthin, 

 and guanin, which had been demonstrated in previous work to be 

 a constituent of the organic matter of the soil, were found to exert 

 a favorable influence upon wheat seedlings grown in culture Solu- 

 tions. The greatest beneficial eflfect was noticeable in the absence 

 of nitrates; however, when nitrate was also added, less of it was 

 used, than in their absence-showing that it might be protected or 

 replaced by the purins. A. R. Davis (St. Louis). 



Spargo, M,, The heat produced by leaves. (Plant World. 

 XV. p. 277—293. 1912.) 



In duplicating the work of Molisch, in 1908, upon heat pro- 

 duced by fresh living leaves, the author falls to obtain substantiating 

 results. Very little or no increase in temperatures was noted in 

 using varying quantities of leaves packed in carefully insulated 

 receptacles. A. R. Davis (St. Louis). 



