The results in the above experiments show that where only enough 

 superphosphate was applied for the previous year's crop, the results 

 are about equal, but where more manure is applied than is required 

 for the first crop, the effects on the second crop are more marked 

 in the case of superphosphate than bone-meal. To carry the ex- 

 periments still further the t>ame pots after the oats were gathered, 

 with only the addition of some nitrogenous manure, were compared 

 with the pot that had not received any manure. The crop that was 

 chosen was mustard. The following are the results : 



Professor Maercker further experimented with superphosphates, 

 dissolved raw bone meal, dissolved glue free bone meal. The copy 

 of the results of these experiments with dissolved bones, which I 

 have, does not say whether he added nitrogen to the super- 

 phosphates to equalize it with the nitrogen in the bones. From 

 the results it is almost evident he must have done so, otherwise we 

 could not expect the results he obtained. He says that dissolved 

 bone meal is almost equal in value as a fertilizer to superphosphate. 

 I should be inclined to place a higher value on dissolved bones as they 

 contain a certain percentage of nitrogen, and the insoluble phos- 



