1917] Lipman-Gericlce : Smelter Wastes and Barley Growth 563 



also correlations are drawn between some of these factors and 

 the complete yields of dry matter. 



11. Some practical and theoretical phases of the smelter 

 question are discussed, and the evidence above given is employed 

 to show that from the large practical standpoint the solids 

 of smelter wastes cannot justly be considered a menace to 

 agriculture. 



12. Many other points of interest are discussed in connection 

 with the smelter problem as a whole and with the results of our 

 experiments. 



Transmitted September 7, 1916. 



