206 DOMESTICATED ANIMALS AND PLANTS 
neglected for no other reason than this, namely, that too good 
a start was already made with Old-World material; and only 
where something distinctly better was discovered here, as corn 
and the turkey, were American races utilized, excepting only 
when Old-World forms failed, as they did with the grape and 
the gooseberry. 
The material of this part may be used in three ways: as text, to 
follow appropriate chapters in Part I as indicated ; as reference 
matter, to be taken in connection with Part I ; or as independent 
matter. 
