338 Latham : Stimqlation of Sterigmatocystis 



r 



toxic compounds, all with concordant results ; namely, that those 

 substances which in larger amounts are fatal, serve to stimulate 

 the organism to increase in activity when present in sufficiently 



small quantities, in accordance with the generahzation of Hueppe.* 

 In addition, Ono f has found that the waste through oxalic acid 

 formation is at the same time lessened ; and Watterson % that 

 although there is greater expiration of CO., the increase is only 

 parallel with that of the crop and its production relatively normal. 



ng with yeast ; Hueppe,I| Effront, t and Lindet ** 

 and Ono ft and Livingston n with algae have 



§ 



mvitn bacteria ; 



^ -T" -T^ 



reached like conclusions as far as growth is concerned 



Copeland and Kahlenberg,|!|l and Kahlenberg and True, 

 and more lately Kanda^fff working with higher plants tell of 

 stimulation caused by salts. Similarly Copeland XtX ^^^ obtained 

 increased CO^ evolution from work with phanerogams and tad- 

 poles, interpretating the apparent vigor, however, as an evidence 

 of harm rather than benefit. 



Townsend§§§ mixed ether with water supplied to seeds and 

 thus hastened germination. He has also show^n that seeds, sub- 

 jected to HCN gas null for a short time, sprout sooner and grow 



* Hueppe, F. The Principles of Bacteriology, 89, 90. Trans, by E. O. Jordan. 



J Watterson, A. The effect of chemical irritation on the respiration of fungi. 

 Eull. Torrey Club 31 : 291. 1904. 



^ Schulz. Ueber Hefegifte. Bot. Zeit. 46 : 6lo. 1888. 



^Effront. Compt. rend, 119: 169, 1894. 

 ** Lindet. Compt. rend. 138 : 508. 1904. 



j: J Livingston, B. E. Chemical stimulation of a green alga. Bull. Torrey 

 Oub 32 : I, 1905- 



Copeland, E. B. & Kahlenberg, L. The influence of the presence of pure 

 metals upon plants. Trans. Wis. Acad. 12: 454. 1899. 



*** Kahlenberg, L. & True, R. H, On the toxic action of dissolved salts. Bot. 

 Gaz. 22: 81. 1896. 



ttfKanda, M. Reizwirkung einiger Metallsalze auf das Wachsthum hoherere 

 Pflanzen. Jour. Coll. Sci. Imp, Tokyo 19: i. 1904. 



ttt Copeland, E. B. Chemical stimulation and the evolution of CO^. Bot. Gaz. 

 35 '- 81. 1903. 



§§§Townsend, C. O. The effect of hydrocyanic acid gas upon grains and other 

 seeds. Bot. Gaz. 31 : 241. 1901. 



jlllll Townsend, C. O. The correlation of growth under the influence of injunes. 

 Ann. Bot. 11 : 509. 1897. 



