A GUIDE FOR KEEPERS OF POULTRY 203 
A series of bulbous masses now begin to show as the 
beginning of the vertebra, the eyes begin to show, seem- 
ingly disproportionally large, and the several sacs which 
are to develop as the brain may be seen. The wings, 
skin, thighs, stomach, intestines and liver now begin to 
develop, and on the fifth day the lungs begin to appear. 
Two days later the beak, skin and feathers may be dis- 
tinguished and by the eighth day the beak, wings, thighs, 
legs and brain begin to assume distinctive form. By the 
eleventh day the circulation begins to take permanent 
form and the arterial blood is distinctly brighter than 
that from the veins. From this time growth is rapid. 
All the vital organs except the lungs are working, and 
the body of the chick rounds out to completeness until 
at the 18th day the complete and perfectly-formed chick 
lies in the shell, the yolk still being outside the body. At 
this time the chick is apparently doubled and cramped 
into the space in the shell in a way completely to prevent 
it from action, but this is only apparent, as it is in the 
best possible position to break its way to liberty. The 
legs are doubled up against its body and the head is 
tucked under one wing so far that the beak extends be- 
yond the line of the back. 
The chick now begins to tap against the inner side of 
the shell, unavailingly at first, as its blows with its beak 
are too weak to make any apparent impression. The 
wing supports the head so as to make it possible for the 
chick to deliver the strokes of the beak in the same line 
all the time and finally the shell is broken through. Now 
the position of the claws is such that by a little exertion 
they catch into the lining of the shell so as to revolve the 
chick in the shell. The break once made in the shell, the 
revolving motion of the body causes a thin line to be 
