34$ Mr, W i lson's Description of a 
arose from the right ventricle, and the pulmonary artery from 
the left; the reverse of what ought, in the regular course of cir~ 
culation, to have taken place ; (the veins were as usual ; ) and no 
communication was found between the one vessel and the other, 
except through the remains of the ductus arteriosus, which was 
not larger than a crow quill, and a small part of the foramen 
ovale, which still continued open ; yet this child lived for two 
months. In the following case of monstrous formation of the 
heart, there is this very great singularity, that nature seems 
to have substituted, very exactly, the circulation which takes 
place in some amphibious animals, for that which is natural to 
the human species. 
The infant had arrived at its full time, and lived seven days 
after its birth. Instead of the usual integuments, muscles, &c. 
a membranous bag appeared to protrude on the upper and 
fore part of the abdomen, extending from the last bone of the 
sternum some way below the middle of the belly, and out- 
wards, so as to be nearly circular : the navel-string seemed to 
enter this membrane near its middle, and to wind superficially, 
for some little way, towards the left side ; it then dipped into 
the abdomen, at the place where this membrane joined the 
usual coverings. Within this bag, the appearance of which 
was very nearly similar to that of the chorion and amnios 
which envelop the foetus at birth, but thicker in consistence, 
a tumour was perceived, possessing considerable motion, from 
the nature of which, no doubt was entertained that it was the 
heart. 
During the short period of the child's life, it was seen and 
examined by a number of professional men. Upon its death, 
the tumour was carefully opened by Mr. Mo hell, in the pre- 
