170 



PROCEEDINGS OF THE CHEMICAL DEPARTMENT. 



analysis was therefore confined to the leaves and stems, the roots 

 being separated at the point of junction. At this stage the 

 leaves and stems were burned and analysed together, but the 

 seed beans were examined separately, as it seemed probable that 

 the composition of their ash, compared with that of the ripe 

 produce, might show some interesting points of difference. The 

 results were — 



Peroxide of Iron 



Lime 



Magnesia 



Chloride of Sodium 



Soda 



Potash 



Sulphuric Acid . . 



Phosphoric Acid 



Silicic Acid 



Carbonic Acid . . 



Sand 



Charcoal 



Entire plants without roots. Beans. 



3-14 3-03 



25-01 24-21 



3-20 

 8-47 

 1-42 

 3-99 

 6-24 

 6-08 

 6-49 



3-18 

 4-18 

 5-59 

 2-19 

 3-04 

 6-51 

 2'28 



22-76 20-51 



13-20 23-86 



2-27 



100-00 100-85 



These results, calculated after deduction of sand, carbonic acid, 

 and charcoal, give — 



•Peroxide of Iron 

 Lime 

 Magnesia 



Chloride of Sodium 

 Soda 

 Potash 



Sulphuric Acid . . 

 Phosphoric Acid 

 Silicic Acid 



4-90 5-58 



39-07 44-67 



4-99 5-86 



13-23 7-71 



2-21 10-31 



6-23 4-04 



9-74 5-61 



9-49 12-01 



10-14 4-21 



100-00 100-00 



From these analyses it appears that the total quantities of 

 substances contained in the crop growing on an acre of land 

 amounts to the following numbers in pounds avoirdupois: — 



Water 



Albuminous compounds 



Other organic matters 



Peroxide of Iron 



Lime 



Magnesia 



Chloride of Sodium 



Soda 



Potash 



Sulphuric Acid . . 



Phosphoric Acid 



Silicic Acid 



807-19 91-09 



34-74 ) 



Total 



Nitrogen 

 Total ash 



67-98 

 0-49 

 3-92 

 0-50 

 1-32 

 0-22 

 0-62 

 0-98 

 0-95 

 1-02 



919-93 

 5 - 56 



10-02 



) 



23-71 



0-047 

 0-372 

 0-048 

 0-064 

 0-086 

 0-034 

 0-046 

 0-101 

 0-035 



115-630 



0-833 



