Latham : Stimulation of Sterigmatocystis 339 



more rapidly than those not so treated ; that Ave)ia seedh'ngs 

 grown in a sufficiently weak atmosphere of ether are at first retarded 

 and then accelerated, finally returning to their normal rate of 

 growth if the shock be not too long continued ; and that in small 

 amounts ether vapor will aid germination in the spores of Pcnicil- 

 lium and Mucor^^ although larger doses are inimical. Duggar f 

 says that a saturated atmosphere of chloroform is fatal to the 

 spores oi Aspei-gilbis fiavus and PJiycornyces and without benefit to 

 Sterigmatocystis^ and that ether is of no consequence as a stimulant 

 in germinating Aspergilhts. With Aspergillus {Sterigmatocystis) 

 fiiger, Kosinski % finds respiration retarded when exposed to ether 



X ■ 



fumes. 



Ewart,§ working with chloroform in the water of water plants 

 noted suspension of CO^ assimilation agreeing with the earlier 

 results of Claude Bernard. Kegel, || however, finds with Elodea 

 canadensis an increment of CO2 assimilation in some percentages 

 of ether and chloroform, but a sudden check in the case of a lesser 

 amount On the other hand, Bonnier and Mangin^f were able, by 

 adding ether carefully, to stop assimilation oi QO^ without afifecting 

 respiration, an observation in accordance with that of Schwarz,^* 

 who, with both ether and chloroform, has recorded stoppage of 

 oxygen evolution not accompanied by elimination of COg evolution 

 until the plant was fatally affected. Ewart's ff results with mosses 

 were similar. Movement in the protoplasm o{ Philotria {Elodea), 



*Townsend, C. O. Effect of ether upon the germination of seeds and spores. 

 Bot. Gaz. 27: 458. 1899. 



tl^uggar, B, M. Physiological studies with reference to the germination of cer- 

 tain fungous spores. Bot. Gaz. 31 : 38. 1 901. 



JKosinsti, I. Die Athmung bei Hungerzustanden u. unter Einwirkung von 

 mechanischen u. chemischen Reizmitteln bei Aspergillus niger. Jahrb. Wiss. Bot. 



37: 137- 1902. 



\ Ewart, A. J. Action of chloroform on CO^ assimilation. Ann. Bot. 12: 415. 

 1898. 



Kegel, W. Ueber den Einfluss von Chloroform und Aether auf die Assimila- 

 tion von Elodea canadensis. Inaug. Dissert. Gottingen, 1 905. 



f Bonnier, G. & Mangin, L. Recherches sur V action chlorophyll ienne s^parfie 

 de la respiration. Ann. Sci. Nat. VII. 3 : 5. 1886. 



**Schwarz, F. Zur Kritik der Methode des Gasblasenzihlens an submersen 

 Wasserpflanzen. Untersuch. Bot. Inst, zu Tubingen, i : 97. 1881, 



ft Ewart, A. J. On assimilatory inhibition in chlorophyllous plants. Jour. Linn. 

 Soc. 31 : 364. 1896. 



