6o8 SCIENCE PROGRESS. 



(8) H. B. GUPPY. The River Thames as an Agent in Plant-dis- 



persal. Ilpt'd, 29, 333, 1893. 



(9) A. J. EWART. Vitality and Germination of Seeds. Trans. 



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(10) L. Just. Ueb. d. Einwirkung hoherer Temperaturen, etc. 



Cohn's Beit rage z. Biol. d. Pflanzen, 2, Heft 3. 



(11) E. Wartmann. L'influence de froids excessifs sur les 



graines. Bibl. Univ. Geneve. Arxh. Sci. Phys. Nat., 277, 

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(12) E. Wartmann. Ibid. [3], 5, 340, 1881. 



(13) C. DE Candolle and R. PiCTET. Ibid. [3], 2, 354, 629, 



1879. 



(14) C. DE Candolle and R. Pictet. Ibid. [3], 11, 325, 1884. 



(15) R. Pictet. Ibid. [3], 30, 293, 1893. 



(16) Ph. van. Tieghem and G. Bonnier. Observations sur la vie 

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(17) Ch. Cornevin. Ann. Agron., 17, 433, 1891. 



(19) G. J. Romanes. Experiments on Germination. Proc. Roy. 



Soc, 54, 335, 1893. 



(20) Ph. van. Tieghem and G. Bonnier. Recherches sur la vie 



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F. Escombe., 



