r Elements, Symbols and Analyses. 183 



Analyses, continued. 



36. Oak Leaves. 



Moisture at 100 C. . . 9.601 Potassium oxide 0.549 



Organic matter 83.360 Phosphoric acid 0.058 



Mineral matter 6.840 Nitrogen 0.930 



Ferric oxide 0.027 Soluble silica 0.018 



Calcium oxide 0.548 Insoluble silica 4-333 



Magnesium oxide .... 0.267 



37. Sea Weed. (Two samples.) 



i. ii. 



Moisture at 100 C 12.05 14.96 



Nitrogen i . 66 1.28 



Phosphoric acid 44 .17 



Potassium oxide 3.81 .36 



Calcium oxide 2.73 3.86 



Magnesium oxide 1.48 1:30 



Sodium oxide II -75 8.40 



Chlorine 6.40 5.28 



Insoluble matter 7.73 .78 



38. Tobacco Stems. 



Water *3-47 



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 of the phosphoric acid soluble in water. 

 Soluble phosphoric acid 14.55 Insoluble phosphoric 



Reverted phosphoric acid 20 



acid 2.39 



40. Bone-Black. 



Moisture at 100 C. . . . 5.04 Phosphoric acid 16.56 



Ash 67.43 Insoluble matter 37 



