164 Dr. Thomson <m tTie Nutritive Power of Bread of different Countries. 



has been constructed. The azote was obtained by converting it into 

 ammonia and precipitating by bichloride of platinum. 



The Naumburg bread — a town in the south of Prussia, situated in a 

 fine corn country — the Dresden and Berlin bread, were obtained by 

 myself in these cities in August 1842. The flour was probably, there- 

 fore, grown in 1841. The other specimens were procured in the early 

 part of the present year, and are probably of the growth of 1842. The 

 second column gives the quantity of platinum obtained in the experi- 

 ments from which the third column has been calculated. The fourth 

 column gives the relative value ; 100 of Naumburg being equivalent 

 to 115i of Dresden bread. 



Azotized 

 Quantity Principles. 



Analysed. Platinum. Per Cent. Equivalents. 



Naumburg Bread, .... 10 grs. 1-81 grs. 16*49 100 00 



Dresden do — 1-57 14*30 115-31 



Berlin do — 156 14*21 11604 



Canada Flour, 9*9 1*50 13*81 117*23 



Essex do 91 1*30 13*59 121*33 



Glasgow unfermented Bread, 100 1-47 13*39 123*15 



Lothian Flour, — 1*35 12*30 134*06 



United States Flour, . . . _ 1-25 11*37 14503 



Ditto by mechanical analysis, 1099 150*00 



The low position of the American flour as indicated by the first 

 experiment in the table, was so startling, that it was repeated by 

 means of the mechanical process. The result of the analysis of three 

 ounces was as follows : — 



Per Cent. 



Starch, 90200 68*73 



{Fibrin, .... 116*80 \ 



Casein, .... 5*27 ( ,«« .« ^ ^« 



Glutin and Oil, . 304^ 1^0*40 9*93 

 Loss, (Water) . 5*29/ 



Albumen, 14*00 106 



Gum, 60*40 4*60 



Sugar 16*30 1*24 



Water, 189*40 14*44 



3 oz. = 1312*50 10000 



It is from this analysis that the second result is given in the table. 

 It affords a striking confirmation of the accuracy of the first deter- 

 mination. It is only necessary to add that all these specimens were 

 dried at the temperature of 212° before being subjected to experiment. 



BELL AND BAIN, PRINTERS, GLASGOW. 



