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bonate of potassa, and muriate -of potassa, and a 
peculiar odorous animal matter. 
M. Vauquelin states, that he found some speci- 
mens of wool lose as much as 4 5 per cent, in being 
deprived of their yolk ; and the smallest loss in his 
experiments was 35 per cent. 
The yolk is most useful to the wool on the back 
of the sheep in cold and wet seasons ; probably the 
application of a little soap of potassa, with excess 
of grease to the sheep brought from warmer climates 
in our winter, that is, increasing their yolk artifi- 
cially, might be useful in cases where the fineness 
of the wool is of great importance. A mixture of 
this kind is more conformable to nature, than that 
ingeniously adopted by Mr. Bakewell ; but at the 
time his labours commenced, the chemical nature 
of the yolk was unknown. 
