UNDER THE APPLE-TREES 
a vital process also. The making of a loaf of bread 
is, up to a certain point, a mechanical process; then 
higher and finer processes set in. And all the cake 
and pastry and loaves in the bakeshop do not differ 
from the original bin of wheat any more than the 
great family of secondary rocks differs from the un- 
milled harvest of the earth’s original crust. And the 
increase in bulk seems to have been quite as great 
as that which the bin of wheat undergoes in passing 
from the kernel to the loaf or the roll. The leaven 
that went to the making of our shale and sandstone 
loaves seems to have been contributed by the sea 
when the batch was mixed and baked. Little doubt 
that the bulk of the material of the sedimentary 
rocks came through the process of erosion and depo- 
sition from the original igneous rocks, but how has 
it expanded and augmented during the process! It 
seems to have swelled almost as the inorganic swells 
in passing into the organic. 
