260 
HIRUNDINIDiE. 
taken the liberty to differ from him, and to figure it as a 
curious variety of the egg of the Swallow, fully persuaded 
myself, that eggs, which are naturally and characteristi¬ 
cally of a pure white, are unchangeably so, and this I be¬ 
lieve to be a law in the colouring of eggs. 
