Physiologie. — Algae. 51 



Aus 1000 kg. Blüthen gehen 801 gr. Tuberosenöl in das Pomadefett 

 über, ausserdem findet sich noch 70 gr. in den Blüthenrest = 879 zu- 

 sammen. Während der Enf leurage wird also noch 12 mal soviel Oel 

 entwickelt als in den frischen Blüthen anwesend war! 



Was nun die chemischen Bestandtheile anbelangt, so enthält das 

 Tuberosenöl aromatische Estern (Anthranilsäure-Methylester, Benzoe- 

 säure-Benzylester, Benzylalkohol verestert). Bei der Enfleurage wird 

 ausserdem noch Salicylsäure-Methylester gebildet. Die Menge des 

 Anthranilsäure-Methylesters beträgt im letzten Falle das sechsundfünfzig- 

 ache der in der frischen Blüthe enhaltenen. 



Johanna Westerdyk (Amsterdam). 



Plowman, A. B., Certain Relations of Plant Growth 

 to lonization oi the Soil. (Am. Journ. of Sei. Aug. 

 1902. Vol. XIV. 4th Series. p. 129—132.) 

 Subjected plants (seedlings) to electrical currents, using both 

 static and kinetic charges, of varying potential. Concludes 

 that plant protoplasm is soon killed by the conditions vvhich 

 are present about the anode, but within eertain limits is stimu- 

 lated by those about the cathode. The effect appears to be 

 produced rather by the electrical charges of the ions, than by 

 the slight Chemical differences vvhich arise in the region of the 

 electrodes. Negative charges stimulate and positive charges 

 paralyze embryonic tissue of the seedlings. Normally the plant 

 is electro-positive to the soil and hence the positive Charge 

 attracts the negative ions of the soil to its roots. Anything 

 which would facilitate this action would be beneficial, while 

 anything which retards it u'ould be detrimental, a condition 

 actually found. H. M. Richards (New-York). 



Plowman, A. B., E le et r emotive Force in Plants. (Am. 

 Journ. of Sei. Feb. 1903. Vol. XV. 4th Series. p. 94—104.) 



A preliminary paper recording experiments on Liipimis 

 albus, Codiaeiim regalis and Poinsettia sp? Arrives at the 

 following conclusions; the functional activities of the plant 

 cause differences of electrical potential in its parts; the intensity 

 of these differences depend in part at least on the physiological 

 condition of the plant, brief application of forced currents show 

 a modification of the E. M. F. apparently due in part to 

 change of resistance and in part to change in the vital activity 

 of the protoplasm; slight mechanical injuries produce no modifi- 

 cation; severe injuries and high temperatures destroy the 

 normal current, but the reaction current, which may also be 

 duplicated in non-living substance, shows little or no effect from 

 such treatment; extensive injuries to a plant excite an E. ?vl. F. 

 spreading from the point of injury through the tissues. 



H. M. Richards (New-York). 



Bentivoglio, Tito, La Galaxaura adrlatica Zanard. a Taranto 



e la sua area di distribuzione nel Mediterrane o. 



(La Nuova Notarisia. Serie XIV. Luglio 1903.) 



Verf. macht auf das Vorhandensein der Galaxaura adriatica Zanard. 

 im Golfe von Taranto (Süd-Italien) aufmerksam. Diese Floridee 



