346 Transactions of the Canadian Institute. [Vol. VII. 



than the lithium, and because the rate of ascent in the same leaf, varies 

 as the length of the vein. 



A detached leaf is a living thing which may continue its functions, 

 to some extent, for several months after being detached from the plant. 



The food required by woody branches of Salix in the early growth 

 of spring is water. A nutrient solution at this stage proved harmful. 

 Water and nutrient solutions are not absorbed through the bark but 

 affect the developing bud and young leaves in a manner which seems to 

 indicate absorption through Jthe buds. 



Since sea-water affects the atmosphere in such a way as to produce 

 an accumulation of rust upon iron, greater than that produced in an 

 atmosphere under the influence of pure water, it is reasonable to conclude 

 that the atmosphere in the neighbourhood of the sea may affect plants, 

 because physiological processes are associated, in large measure, with 

 chemical processes. 



The best thanks of the writer are due to Professor Goodale for 

 opportunity and much kindly assistance and encouragement in regard to 

 this paper, to Professor Sharpies for material and help in the work on 

 the " spotting " of the Tobacco leaf, and to Mr. Robert Cameron, foreman 

 of the Botanic Gardens, for material cheerfully furnished at all seasons. 



BIBLIOGRAPHY. 



1893. Aderhold. Bot. Zeit., 51 ; II. abth., 161. (On bordeaux mixture). 

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1894, Blackman, F. F. Proc. Roy. Soc, Vol. LVII.; 162. (Gaseous exchange in 

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1875, BOEHM. Sitzungsber. d. k. Akad. d. Wiss., bd., 71 ; 287. Ueber den Veget. 

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1876, BOEHM. Tagbl. d. Versamml. Naturf. in Hamburg, 114. (On water absorp- 

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1829, Boitard. Manuel d. Physiol. V^g. et d. Physique, etc., pt. I, 



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