252 BOTANICAL GAZETTE [September 



EXPERIMENT NO. 3 



In the third experiment, the barium chloride was used in a i per cent 

 solution. As in the preceding experiments, one group of plants was 

 watered with the barium chloride solution and the other with an 

 equal amount of water. Sixteen liters of the barium chloride solution 

 and of water, respectively, were used daily in this experiment. This 

 was commenced on September 15, and was continued to September 21, 

 inclusive. At this time both groups of plants were in good condition, 

 showing no ill effects from the treatment. On September 22 the plants 

 were dug up and dried for analysis. The analyses, made by the Bureau 



Chemistry 



the plants treated with 



barium chloride, ash 37.095 per cent, barium 0.636 per cent. The 

 plants treated with water showed no barium. 



RESULTS 



iminary experiments 



That plants of Aragallus Lamberti endure barium chloride solution as 



1 . • 



with 



is distinctly poisonous. Grouping the analyses, we find that the 



amount 



the 10 per cent solution, a less amount in those treated with the 1 per 

 cent solution, and a still less in those receiving the o . 1 per cent solution. 

 In other words, it appears that in these experiments the quantity of 

 barium salts absorbed varied directly with the amount in the soil. — C. 

 D wight Marsh, Bureau of Plant Industry, U.S. Department of Agriculture. 



