Nitrogen, 



Nitrogen in form of nitrates, 



Nitrogen in form of ammoniates, 



Organic nitrogen, 



Calcium oxide, 



4.62 



2.89 



* 



5.80 



1764-1768. I. Received from South Amherst, Mass. 

 II. Received from Hattield, Mass. 

 III. Received from Fitchburg, Mass. 



IV. Nitrogenous Peruvian guano, received 



Grafton, Mass. 



V. Phosphatic Peruvian guano, received 



Grafton, Mass. 



Moisture at ioo°C., 10.07 



Total phosphoric acid, 11.82 



Soluble phosphoric acid, 3.20 

 Reverted phosphoric acid, 3.80 

 Insoluble phosphoric acid, 4.82 

 Potassium oxide, 8.56 



Nitrogen, 3.1 1 



Nitrogen in form of nitrates, * 

 Nitro. in form of ammoniates, * 

 Organic nitrogen, * 



Calcium oxide, * 



II. 

 8.20 



1 1.04 



2-55 

 2.61 

 5.88 

 9.64 

 3-33 



PER CENT. 

 III. 

 6.65 



3-78 



2.68 



•52 



.58 



1 1.24 



7-85 



IV. 



13.22 



9-34 

 2.18 



5-44 

 1.72 

 1.92 

 6.87 

 •95 

 3-25 

 2.67 

 10.21 



1769-1773- 



I and II. 



III. 

 IV. 

 V. 



SOILS. 



Received from Newton, Mass. 

 Received from Gloucester, Mass. 

 Received from Canton, Mass. 

 Received from Boston, Mass. 



3-92 



1-55 

 1.22 



1-15 

 1 1. 19 



from 

 from 



Moisture at ioo"C., 

 Ash, 



Nitrogen, 

 Potassium oxide. 

 Phosphoric acid, 

 Calcium oxide. 



V. 



12.47 

 18.06 



3.58 



7.82 

 6.66 

 3.02 

 2.97 

 .76 

 1.76 



•45 

 15.48 



* Not determined. 



