NEW FERTILIZER MATERIALS AND BY-PRODUCTS. 181 



injurious to vegetation. It might, however, have a deleterious 

 eii'ect upon the beneficial soil bacteria. The sample has been 

 submitted to the college bacteriologist. Dr. Marshall, who will 

 later make some studies to decide this point. The oi)iuion was 

 expressed by Dr. Marshall that this small percentage of arsenic 

 would not prove harmful when used as above specified. 



In general, it might be said that these various refuse lime 

 products, including the product from acetylene gas plants, may 

 be used to advantage locally when they can be had for the 

 hauling or at a small cost. It is usually the safest way to make 

 the application of these i)roducts in the fall or winter, so as to 

 allow a chance for the oxidation of any injurious compounds 

 that may be present. 



