c a, ] 
V. A Letter from M. le Cat, M. 2). F. R. S. 
Surgeon to the Hotel Dieu at Rouen, and 
Royal Demonjirator in Anatomy and Sur- 
gery , to C. Mortimer, M. D. Seer. R. S, 
concerning the Foramen ovale being found 
open in the Hearts of Adults , and of the 
Figure of the Canal of the Urethra. Tranf- 
lated from the French by T. S. M. D. 
F. R. S. 
SIR, 
I Have feen in the Fhilofophical Tranfaffiions of 
the Royal Society, N° 439. that you are 
not difpleafed with Obfervations on the Foramen 
ovale in Adults. The Anatomical Amphitheatre, 
which I have eftablifhed at Roaen, furnrfhes me with 
frequent Opportunities of obferving. Laft Winter, 
I applied particularly to the Circulation of the Blood 
in the Foetus— — The Advantages that may be drawn 
from the Parallel, put me upon making the like 
Experiments on Adults. I have a number of times 
meafured the Cavities of the Heart, and Veflels that 
depart from it, in both thefe Subje&s ; and I therein 
examined the State of the Foramen ovale, Canalis 
arteriofus , &c. I now fend you my Remarks on the 
Foramen ovale open in the Adult, and fome few 
others on the Figure of the Urethra. 
I have the Honour to be, SIR, 
Tour mojl humble 
and mojl obedient Servant, 
Claud. Nic. Le Cat. 
1. Of 
