Pa er 
Different Animals, &c. 493 
gréés ; all of which I shall enumerate, beginning 
with the smaller ones and proceeding to the 
greatest. 
1. Fetuses have been born, in which only a 
part of the brain, of greater or less extent, was 
wanting. In these instances the upper, or vaulted 
part of the skull, or at least a considerable portion 
of the bones, composing it, has been also found 
wanting: The brain is also\ sometimes very 
different from.the natural state, in form, colour 
and consistence as well as in bulk: Dr. Monro, 
in one case, found the substance, occupying the 
place of the brain, not more bulky than a small 
nut and of a red colour throughout, resembling 
a clot of blood. The proper integuments of 
the skull are for the most part wanting, the 
degenerate portion of brain being only protected 
by athin pale or reddish membrane: In one fetus, 
however, of this kind, of which a description © 
and figure are given by Professor Sandifort, the 
covering of the brain approached more nearly 
to the nature of the scalp and was thinly covered 
with hairs. 
This kind of monster, which is generally, 
though not very properly, styled acephalous, since 
the base of the skull and face are not wanting, 
is by no means an uncommon occurrence. Most 
accoucheurs in extensive practice have met with. 
one or more, I have brought one into the 
