224 Mr. Gibson's Description of an 
point of view, the resources of nature in accommodating her 
means, or modifying her materials to any new situation. All 
that is remarkable, is the conjunction of two bodies complete 
in themselves : the organs which compose them have their 
ordinary structure and arrangement ; the anatomist or phy- 
siologist anticipates nothing curious in their internal configu- 
ration. It is principally in those instances of unnatural 
deviation, where some parts of the body are formed double, 
and others single, that the resources of nature become appa- 
rent, in adjusting parts, which, in the natural state of the body, 
have no adaptation. 
Of this kind is the singular foetus, of which I shall now 
proceed to offer the description. 
This curious production was formed with two heads placed 
side by side, united apparently to one bod^Vith two legs and 
two arms. The one head expressed the character of a male, 
the other evidently that of a female. This distinction of sex, 
conspicuous enough from mere inspection, was still corrobo- 
rated by the conformation of the organs of generation. From 
external examination it was plain, that there w 7 ere two spines 
corresponding to the two heads ; these were found to termi- 
nate in a double os sacrum, tipped with two ossa coccygis- 
The superior part of the spines diverged considerably, so that 
when the two faces were turned towards each other, the lips 
came in contact. Above the first lumbar vertebra, they ap- 
proached each other, still however forming two independent 
vertebral canals, for the passage of the spinal marrow from 
each head. In consequence of the divergence of the spines at 
their superior part, the chest was formed much broader than 
natural. The common number of ribs were placed on the; 
