Physiologie. 265 



der Flüssigkeiten von einem Gefilss in das andere geschieht mittels 

 kleiner Metallpumpe oder durch Hineinblasen, wobei die Luft vor- 

 her Sublimatlösung passiert. Das Kulturgefäss ist mit einem heiz- 

 baren Wasserbad umgeben. Hersteller: Franz Hugershoff in 

 Leipzig. G. Bredemann. 



Cook, O. F., Wild wheat in Palestine. (Bull. 274. Bureau ot 

 Plant Industry. U. S. Dept. Agr. 1913.) 



The author of this bulletin of 56 pages states that wild wheat is 

 widely distributed on the slopes of the Anti-Lebanon ränge of 

 mountains in northern Palestina and Syria , where it behaves as a 

 truly indigenous plant. It is especially abundanton limestone, where it 

 comes to maturity at the end of June. Both proterogynous and prote- 

 randrous flowers are found, together wich other adaptations for 

 cross fertilization , and some forms are seif fertilized. The joints of 

 the rachis separate from each other at maturit}', but remain per- 

 manently attached to the spikelet, forming beak-like organs, barbed 

 on each side with stiff bristles. The function of the joints is to faci- 

 litate the movements of the spikelets, which creep into crevices of 

 rocks or bury themselves in the soil. The strongly barbed awns also 

 assist in the dissemination of the spikelets, which develop never 

 more than two seeds, often only one. The author considers the 

 wild wheat as a new species, Triticmn hernionis and considers it 

 related to emmer T. dicoccum and einkorn T. monococatm . 



Harshberger. 



Darwin, F. and D. F. M. Pertz. On a new method ofesti- 

 mating the aperture ofstoraata. (Proc. Roy. Soc. LXXXIV B. 

 p^ 136-154. 1911.) 



The apparatus ("porometer") is similar in principle to that 

 devised in 1873 by N. J. C. Müller but differs in construction. A 

 current of air is drawn through the stomata of a living leaf, its 

 velocity being measured by the fall of a water column. At a con- 

 stant pressure the rate of air-flow is necessarily dependent on the 

 size of the stomatal pores, and it is accordingly found that agencies 

 such as darkness or loss of water supply, which are known to dimi- 

 nish stomatal aperture, cause a striking drop in the rate of air-flow 

 as recorded by the porometer. F. Cavers (London). 



Hapvey, E. M., The Action of the Rain-Correc ting Atmo- 

 meter. (The Plant World. XVI. p. 89—93. Mch. 1913.) 



This paper details experiments which were undertaken to de- 

 termine how the instrument ought to act under various assumed 

 conditions and with respect to the Operation of the raincorrecting 

 apparatus. Harshberger. 



Irving, A. A., The effect of Chloroform upon respiration 

 and assimilation. (Ann. Bot. XXV. p. 1077—1099. 1911.) 



A detailed study of the influence of narcotics on the processes 

 of assimilation and respiration, confirming conclusions of earlier 

 writers that small doses of poisons stimulate while larger ones 

 inhibit these processes. Details are given of the results of experi- 

 ments on respiration in Hordeum with different strengths of chloro- 



