ANALYSES OF THE OAT. 



95 



the same organ may and do differ in composition. This difference is no doubt due in 

 part to the ascent of fluids, after the roots have performed their office; or, in other words, 

 to the law of the upward and outward movements of the sap, which has been already 

 referred to. 



I. ANALYSIS OF THE STRAW OF THE TANTAIN OAT. 



1. Unripe oat straw. 



Top. Bottom. 



Silica 14-939 19-823 



Phosphates 23-959 13-039 



Carbonate of lime 5-921 11-336 



Magnesia .------ 1-206, 3-125 



Potash - - - - - - - 45-072 43-541 



Soda 2-200 1-251 



Sulphuric acid 4-206 5-016 



Chlorine -. 2-497 2-866 



2. Ripe oat straw. 



Top. Bottom. 



Silex - ...... 14-839 12-417 



Phosphates 10-637 9-355 



Carbonate of lime 8-765' 8-939 



Magnesia 0-774 0-604 



Potash - - - - ■ - - 50-623 53 -484 



Soda -- 7-727 5-994 



Sulphuric acid 4-044 6-800 



Chlorine 2-586 2-395 



It will be observed, that in the four preceding analyses, the percentage is calculated 

 without organic matter or carbonic acid, both of which necessarily vary in every kind 

 of ash. 



3. Analysis of the phosphates of the unripe straw. 



Top. Bottom. 



Phosphates 4-290 2-220 



Phosphate of peroxide of iron ... 0-210 0-180 



Lime 0-698 0-698 



Magnesia 0-840 0-597 



Silicic acid ------- trace. 0-060 



Phosphoric acid - - . - - - - 2-542 0-685 



