Some Observations on Manuring with Bone-<1uat. 



lip* 



acid. This different behavior from bone dust is very easily explained by 

 the absence of organic matter in bone ash, excluding therefore the possibility 

 of bacterial growth. 



Further more, it becomes evident that potassium carbonate has acted 

 chemically on the bone dust with the formation of potassium phosphate, as 

 becomes clear in comparing V and VII. The presence of chloroform in 

 this case, depressed the dissolution of phosphoric acid comparatively little, 

 proving that the chemical influence of potassium carbonate on bone dust was: 

 much more pozverful, than the effect of the bacterial action. 



Further it becomes clear that the potassium carbonate acts with much 

 more difficulty on bone ash than on bone dust (Compare IV and VIII with 

 V and VII). 



As a general result, however, it follows that the depressing effect which, 

 potassium carbonate would no doubt exert on account of its alkalinity on 

 the availability of bone dust is counterbalanced by its chemical action oa 

 bone dust in which gradually potassium phosphate and CcJcium carbonate 

 are produced. 



