326 Physiologie. 



favorable conditions was rarely if ever benefitted. Lime which 

 lessens the injurious action of copper salts also retards the 

 stimulating effects, yet by the right proportions a slight increase 

 of starch production is possible while the toxic effects are mini- 

 mized or entirely neutralized. H. M. Richards (New York). 



Curtis, C. C, Some observations on transpiration. 

 (Bull. Torr. Bot. Club. XXIX. 1902. p. 360—373.) 



Transpiration was found to exhibit a daily periodicity with 

 a maximum at midday. Minor variations not in accordance 

 with the effect of external forces were observed. No Variation 

 in the rate of transpiration was brought about by changes in 

 atmospheric humidity of less than 8°/o. The amount of tran- 

 spiration is indicative of the fact that the stomata of most plants 

 are open in darkness. Mac Dougal. 



DANDENO, J. B., An In vestiga tion into the Effects of 

 Water and Aqueous Solutions of Some of the 

 Common InorganicSubstances onFoliageLeaves. 

 (Transactions Canadian Institut. Vol. VII. p. 238 — 350. 

 Dec. 1901.) 



After chapters devoted to the introduction and a historical 

 sketch the topics considered in the paper are taken up in the 

 following order, numbered as they appear below. 



III. Absorption of Water by Foliage Leaves; IV. Dew, 

 Guttation Drops, Calcareous Incrustations; V. On the Acid or 

 Alkaline Quality of Distilled Water which has Remained upon 

 a Leaf ior Some Time; VI. On Feeding a Plant Through the 

 Leaves by a Nutrient Solution; VII. On the Effect of Solutions 

 Applied to the cut Ends of Petioles of Leaves; 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 Mixture. Tobacco Spotting, 

 natural, artificial; IX. Gases and Salts in the Air and their 

 Effects Upon Plants: Experiment with Sea Water and Salt 

 Solution, Analyses of Leaves and Gilbert, Experiments of 

 R. Angus Smith, Application of Experiments; X. On the 

 Effects of Water and Nutrient Solutions Upon Developing Buds 

 of Willow Twigs". Following this is a short section of two 

 pages for the general summary and conclusions and the whole 

 is concluded by a bibliography. H. M. Richards (New York). 



Mac Dougal, D. T., The temperature of the soil. (Jour. 

 N. Y. Bot. Garden. III. 1902. p. 125—131.) 



The Hailock termograph for making continuous records of 

 soil temperatures at any depth is described, and the results of 

 the observations at a depth of 30 cm of six weeks are given in 

 a diagram. Mac Dougal. 



