142 MISSOURI BOTANICAL GARDEN. 



results with formalin, picric acid and corrosive sublimate. 

 Dandeno in a recent paper 4 describes at considerable length 

 a number of experiments which he performed to test the 

 effects of water and solutions of various salts on foliage 

 leaves. He finds " that pure water may be absorbed?" 

 Nutrient solutions (?) he finds are absorbed when sprayed 

 upon the growing leaf, as evidenced by the increased dry 

 weight. The part of his paper which has a particular 



th 



<< 



a solution applied to the leaf surface." He experimented 



SO 





NaA 



tion of CuS0 4 , and nutrient solution. The plants used were 

 Ampelojms. He likewise experimented with CaH 2 (C0 3 )2 

 and Ca(OH) 2 on leaves of Begonia, Primula obconica. 



P. jitellafa. Pela 



yonium and Heliotr opium . As a result 

 of his tests he finds that some of the solutions produced 

 yellow and some brown spots on the surface of the leaves, 

 that many of the salts are absorbed through both surfaces 



:1 



spot when the water evaporates. The solutions 



d 



were 



side. 



Only in one case did he notice any structural changes in 

 the leaves. In spraying tobacco leaves with caustic & soda, 

 \% and 2^% strength, peculiar spots were formed. The 

 tissues in these spots were dead in the center and 



sur- 



by a ring of expanded 



e>o 



which contained larger and more numerous chlorophyll 

 grains than the normal tissue of the leaves. He si 

 that the increase in the number and size of the chloroplasts 

 might be due to a stimulus exerted by the caustic solution 

 and refers to the results of Griffon, Ewart and Mayer and 

 others, who found that potassium nitrate and potassium 

 carbonate affected the chloroplasts in some way, resulting 

 in increased dimensions and, in general, in a deeper green 



