MR. R. RIGG'S EXPERIMENTS ON NITROGEN IN VEGETABLE PRODUCTS. 399 



Table VI. 



I Carbon. 



Flour of wheat not nearly ripe 



Flour of the same kind nearly ripe . . 

 Leaves of the wheat not nearly ripe . . 

 Leaves of the same when nearly ripe 

 Stems of the wheat not nearly ripe . . 

 Stems of the same when nearly ripe. . 



Chaff of wheat not nearly ripe 



Chaff of the same when nearly ripe . . 

 Common grass not growing freely 

 Common grass gathered at the same "1 



time, growing very freely J 



Turnip when attacked by the fly .... 



Cabbage leaf not eaten 



The part eaten by insects 



The insects themselves 



Green part of another cabbage leaf . . 



White part of the same 



Tendril of the same 



Very centre part of the cabbage .... 



Root of the same plant 



Red clover stems 



Leaf 



Flower 



Potato itself . 



Stem of the same 



Leaves of the same 



Apple of the same 



Corolla of the same 



Pistils of the same 



Young carrot, ^ of an inch in diameter 



Leaves of the same , 



Stems of the same . . , 



41-2 

 40-6 

 37-6 

 38-4 

 39-8 

 38-8 

 35-5 

 31-2 

 41-1 



39-5 



35-5 

 39-5 

 39-7 

 36-0 

 39-9 

 39-2 

 38-8 

 33-0 

 39-2 

 29-6 

 28-6 

 30-4 

 37-1 

 25-3 

 39-8 

 32-9 

 38-8 

 36-2 

 33-1 

 30-4 

 28-7 



Hjdr. 



Oxygen. 



Nitr. 



Resid. Water. Total. 



1-8 

 0-5 



0-8 



1-6 



1-3 



0-8 

 2-7 

 1-7 

 1-4 

 0-4 



1-4 

 0-5 



2-2 

 1-5 

 0-8 



8-1 



7-3 

 1-7 



3-1 



4-8 

 13-8 



3-8 



7-7 

 10-2 



18-1 



16-4 

 8-5 



2-8 



2-9 

 2-3 

 3-3 

 2-1 

 3-5 

 1-3 

 1-8 

 1-3 

 4-4 



5-6 



8-0 

 8-1 

 5-7 

 6-3 

 6-5 

 8-0 

 5-4 

 4-1 

 5-5 

 2-5 

 4-2 

 3-6 

 2-9 

 3-1 

 8-5 

 3-9 

 3-3 

 4-6 

 2-9 

 2-7 

 1-7 



2-0 

 1-0 

 4-2 

 4-6 

 4-0 

 4-0 

 10-8 

 11-0 

 5-5 



6-5 



13-4 

 5-9 

 8-0 



14-0 

 4-7 

 4-9 

 6-3 

 4-0 

 4-5 

 9-8 

 5-0 

 5-0 

 8-4 



15-0 

 9-4 

 5-6 

 4-4 

 9-6 

 8-5 



10-0 



11-2 



52-1 

 55-6 

 46-8 

 54-9 

 51-9 

 55-9 

 44-6 

 54-8 

 45-9 



100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 



46-8 = 100 



43-1 

 41-7 

 32-8 

 42-4 

 45-1 

 47-1 

 46-8 

 57-2 

 49-4 

 57-7 

 54-5 

 60-8 

 55-2 

 38-5 

 41-8 

 41-2 

 45-0 

 47-4 

 54-0 

 56-1 

 55-6 



100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 

 100 



Nitr. for 

 1000 Carb 



70 



57 



87 

 55 

 87 

 33 

 50 

 42 

 107 



141 



224 



203 



143 



175 



162 



205 



138 



124 



141 



83 



145 



119 



79 



123 



214 



117 



85 



129 



88 



90 



59 



There appear indeed to be various chemical actions taking- place, in which these 

 two elements are eminently concerned, viz. in the preparation of the food of the plants 

 by the roots, and in combining this food with the other elements and fitting the 

 whole to the various purposes of the plants. 



Throughout the whole course of my experimental inquiry, I have not met with one 

 instance wherein we have a large proportion of nitrogen and residual, that we have 

 not violent chemical action and quick growth of the plants, all other circumstances 

 being favourable. 



By analysing the leaves of trees we may throw further light upon the operation of 

 nitrogen. Of the almost numberless vegetables which cover the face of the earth, 

 there are very few, if any, whose growth and produce afford us more information 

 upon the chemical changes which occur during the growth of plants and the decom- 

 position of vegetable matter than the vine. Its abundant flow of sap in the spring 

 yields us a most important product for determining its food. Its foliage furnishes us 

 with a plentiful supply of leaves for examination at different seasons : and by allow- 



