38 ANALYSES OK THE POTATO. 



2. Analysis of the phosphates. 

 Phosphates 38-500 



Phosphate of peroxide of iron - 7 '900 



Lime 2-933* 



Magnesia 0-055 



Silicic acid - - - - - - trace. 



Phosphoric acid - - - - - 27 612 



For an analysis of the soil upon which this potato grew, see Vol. I, p. 342. 



3. Organic aiialysis of the Mercer potato. 

 Size the same as that from which the ash was obtained. 



PROPORTIONS. 



Water of the ends 79-509 



Dry matter in the ends 20-492 



Ash of the ends ...... 0-579 



Ash calculated dry 3 - 746 



ANALYSIS. 



Half from which albumen Half from which albumen 

 was separated. was not separated. 



Starch * 9'710 9'710 



Fibre 5-779 5-779 



Gluten 0-205 0-205 



Fatty matter 0-084 0-034 



Albumen 0-249 0-249 



Casein 0-506 0468 



Dextrine 0-721 1265 



Sugar and extract 3-931 2-638 



21-185 20-398 



It is found that the amount of water, ash, etc. diner in the ends of the potato. The 

 following results exhibit this fact : 



1. Seed or rose end. 2. Heel end. 



Per cent of water 83-839 75-177 



Dry matter 16-161 24-823 



Ash 0-725 0-431 



Ash calculated dry 5-197 2-296 S. 



These two results with the ends may be compared with the mean, or both ends used 

 together. It becomes necessary, from these differences in the composition of the ends, to 

 examine them separately when time will permit. The result is interesting, and agrees 

 with other facts in the same class. 



