Nitrogen contained in Alimentary Substances. 353 



proportion of nitrogen contained in them determined by pre- 

 vious observers; and we believe we shall best introduce the 

 subject by a concise representation of that which has been 

 done in regard to the vegetable part of our aliments, which 

 will likewise afford the best means of comparing the result* i 

 of our experiments on animal substances. 

 - The following table shows the amount of nitrogen contained 

 in 100 parts of the dry vegetable bodies named in it: — 



Rice 1-39 



Potatoes V5 



Turnips 1'7 



Rye 1-7 



Oats 2*2 



Wheat 2-0 to 2'3 



Carrots 2*4 



Barley 2-0 



Maize 2*0 



Peas 3-8 



Lentils 4*4 



Haricots 4*5 



Beans 5*1 



White bread 2'27->i 



Brown bread ..... 2*63 



Glasgow nnfermented bread 2*14' 



Essex flour 2'17 



Canada flour 2*21 



Lothian flour ..... 1-96 



United States flour . . . 1-82 



> 



Boussihgault, Economte'^ 

 Jlurale, Paris, 



1844, 



tome 2™% p. 438. 



R. D. Thomson, in the 

 London and Edinburgh 

 y Philosophical Maga- 

 zine for November 

 1843. 



Agaricus deliciosus . 

 russula . . 

 cantharellus 



4*6 ^ Schlossberger and Doepping, 

 4*2 >- Li^'^'S's Annalen for October 

 a a \ 1844, Chemical Gazette,, 



• ^'Z" J July 15, 1845. ,^, 



Boussingault has calculated from the results of his experi- 

 ments, that which he calls the equivalent nutritive powers of 

 these substances for the domestic herbivorous animals, and 

 Thomson has also given one for those bodies which he exa- 

 mined. We omit these tables, as we have the intention of 

 constructing a table of our own for all the substances which 

 are used as food by man, and which have been hitherto exa- 

 mined in this respect. 



We may now proceed to the relation of our experiments. 

 All the substances made the subject of observation were first 

 carefully dried at 212^ F., and then analysed according to the 

 method of Varrentrapp and Will, slightly modified to over- 

 come some practical difficulties. 



PM.Mao^.S. 3. Vol.27. No. 181. A'bi;. 1845. 2 A 



