272 



horticulturist's rule-book. 



Soluble phosphoric acid 1.54 

 Keverted phosphoric acid 5.92 

 Insoluble phosphoric acid 10.99 

 Potassium oxide . . . 3.46 



Organic nitrogen . . 0.86 

 Nitrogen "as nitric acid 0.33 

 Insoluble matter . . 13.64 



37. Seaweed. (Two samples.) 



I. II. 



Moisture at 100° C 12.05 14.96 



Nitrogen 1.66 1.28 



Phosphoric acid 0.44 0.17 



Potassium oxide 3.81 0.36 



Calcium oxide 2.73 3.86 



Magnesium oxide 1.48 1.30 



Sodium oxide '. . . . 11.75 8.40 



Chlorine 6.40 5.28 



Insoluble matter 7.73 0.78 



38. Tobacco-Stems. 



Water 13.47 



Organic and volatile matters (containing nitrogen 1.93) . 70.85 



Ash (containing phosphoric acid .53) ....... 15.68 



100.00 

 39. Dissolved Bone-Black. 



This material is a superphosphate prepared by treating refuse 

 bone-black from sugar refineries with oil of vitriol, which ren- 

 ders nearly all the phosphoric acid soluble in water. 



Soluble phosphoric acid 14.55 



Reverted phosphoric acid 2.39 



Insoluble phosphoric acid 0.20 



