Ifi8 
In bulbous roots, and sometimes in common 
roots, a large quantity of starch, albumen, and mu- 
cilage, are often found deposited in the vessels ; 
and they are most abundant after the sap has ceased 
to flow ; and afford a nourishment for the early 
shoots made in spring. The potatoe is the bulb that 
contains the largest quantity of soluble matter in its 
cells and vessels ; and it is of most importance in 
its application as food. Potatoes in general afford 
from to \ their weight of dry starch. From 100 
parts of the common Kidney potatoe , Dr. Pearson 
obtained from 32 to 28 parts of meal, which con- 
tained from 23 to 20 of starch and mucilage : and 
100 parts of the Apple potatoe in various experi- 
ments, afforded me from 18 to 20 parts of pure 
starch. From five pounds of the variety of the po- 
tatoe called Captain hart , Mr. Skrimshire, jun. 
obtained 12 oz. of starch, from the same quantity 
of the Rough red potatoe 10^ oz., from the Moulton 
white lif, from the Yorkshire kidney lOf oz., from 
Hundred eyes 9 oz., from Purple red 8^, from Ox 
noble 8J. The other soluble substances in the 
potatoe are albumen and mucilage. 
From the analysis of Einhoff it appears that 7^80 
parts of potatoe afford 
Of Starch - - - - - 1153 
— Fibrous matter analogous to starch 540 
— Albumen - 107 
— Mucilage in the state of a saturated 1 
solution - f 
2112 
