N. y, Acadefflj 

 01 Sclcnceg 



1900-1.] Effects of Water on Foliage Leaves. 237 



AN INVESTIGATION INTO THE EFFECTS OF WATER 



AND AQUEOUS SOLUTIONS OF SOME OF THE 



COMMON INORGANIC* SUBSTANCES ON 



FOLIAGE LEAVES. 



By James B. Dandeno, A.M. 



( Assistiint in the Botanical Museum of Harvard University.) 



(Read ^th May, igoi.) 



CONTENTS. 



Pack 

 I. — Introduction ' . . . . 238 



II. — Historical R^sum^ 241 



III. — Absorption of Water by Foliage Leaves. 248 



IV. — Dew, Guttation Drops, Calcareous Incrustations. . . . 257 



v.— On the Acid or Alkaline Quality of Distilled Water which 



HAS Remained upon a Leaf for Some Time 263 



VI. — On Feeding a Plant Through the Leaves by a Nutrient Solution. 269 



VIL — On the Effect of Solutions Applied to the Cut Ends of 



Petioles of Leaves • . . . . 292 



VIII. — On the Effect of Solutions Applied to Leaf Surfaces in Drops, 

 How A Drop Evaporates, the Physiological Effect of Some 

 of the Constituents of the Bordeaux Mixti;re 308 



Tobacco Spotting: — Natural, Artificial. ...... 320 



IX. — Gases and Salts in the Air and their Effects Upon Plants :— 

 Experiment with Sea-Water and Salt Solution, Analyses of 

 Lawes and Gilbert, Experiments of R. Angus Smith, Appli- 

 cations OF Experiments. . 329 



X. — On the Effects of Water and Nutrient Solutions Upon Develop- 

 ing Buds of Willow Twigs. 339 



XL — General Summary and Conclusions 344 



Bibliography. 346 



* The inorganic substances referred to include some of the strong acids, a few alkalies, and some of the 

 more common mineral salts. 



