Physiologie. 377 



protective or antitoxic action against the pure salt Solution and its 

 disintegrating action when used in conjunction with it. The per- 

 meability-increasing action and the stimulating action both undergo 

 parallel decrease or prevention in the presence of the anaesthetic. 

 It is concluded that in anaesthesia the surface film or plasma mem- 

 brane undergoes a temporary alteration such that under the usual 

 conditions of Stimulation the rapid increase of permeability so 

 essential to that process can no longer take place. 



M. C. Merrill (St. Louis). 



Livingston, B. E., The resistance offered by leaves to 

 transpirational water loss. (Plant World XVI. p. 1 — 35. 

 1913.) 



A modification of Stahl's well known cobalt paper test was 

 worked out by means of which the transpiration from a leaf at a 

 given time can be compared to the water lost from a free water 

 surface. Such comparisons offered a means of obtaining indices 

 which would represent the transpiring power of the leaf and thus 

 the retardation to transpiration due to the internal factors involved. 

 Some of the plants used were Physalis, Datura, Martynia, Sorghum, 

 etc. The indices so obtained showed wide Variation: ranging from 

 .014 in the case of Physalis to .720 for Martynia. Thus Physalts 

 gave off water but .014 as fast as a free water surface, and Mar- 

 tynia .720 as fast. 



The method offers a means by which the daily fluctuation in 

 transpiration may be observed; the resistance, too, of plants growing 

 under the same external conditions may be studied. 



A. R. Davis (St. Louis). 



Osterhout, W. J. V., The permeability of protoplasm to 

 ions and the theory ofantagonism. (Science N. S. XXXV. 

 p. 112-115. 1912.) 



The results of the writer on the electrical conductivity of living 

 tissues of Laminaria in various Solutions indicate that ions readily 

 penetrate living protoplasm and that many ions which penetrate 

 quite rapidly in pure Solutions may be hindered or prevented from 

 entering the cells by the addition of small amounts of calcium Chlo- 

 ride or other salts. W. H. Emig (St. Louis). 



Plate, F., Die neueren Studien zur lonenwanderung im 

 Pflanzenkörper. (Bios. I. 4. p. 391—400. 1913.) 



Ich habe in dieser kurzen Arbeit eine kurze Uebersicht über 

 die neueren Arbeiten über lonenlokalisation und lonenwanderung 

 gegeben, wo hauptsächlich die Versuche Acqua's und Houter- 

 mans in Betracht gezogen wurden. F. Plate (Rom). 



Plate, F., Ricerche sull'azione di nitrati isolati sul periodo 

 germinativo. — Terza nota preventiva. (Rend. R. Accad. dei 

 Lincei. XXIII. Ser. 5. 1 sem. 3. p. 161. 1914.) 



In der ersten und zweiten Mitteilung habe ich die Ergebnisse 

 mitgeteilt, die ich mit den Kationen der I u. II Gruppe erhalten 

 habe. In dieser dritten teile ich die Schlussfolgerungen meiner 

 Versuche mit Elementen der III und IV Gruppe, und zwar 



