KILLED IN THE FRITH OF FORTH. 385 



of the two ventricles, was but slightly noticed, 

 not presenting any thing that was obviously strik- 

 ing or peculiar. A considerable portion, how- 

 ever, of the two great arteries, with their semi- 

 lunar valves, was separated from the ventricles, 

 and afterwards preserved as dried preparations. 

 The coats of these arteries were divisible into a 

 number of strata, though the least minute and 

 easiest division was into four, which is still illus- 

 trated by a preparation preserved in spirits. In its 

 dried state, the circumference of the aorta opposite 

 to the valves, was nine inches and a half; beyond the 

 valves, where the diameter was suddenly diminish- 

 ed, the circumference was seven and a half. From 

 that point, the diameter increased to the middle of 

 the arch, where the greatest circumference was thir- 

 teen inches. From the middle of the arch, de- 

 creasing gradually to the place where it rested on 

 the dorsal vertebrae, its circumference was diminish- 

 ed to six inches and a half. 



The circumference of the pulmonic artery over 

 the valves, was eleven inches and a half. Immedi- 

 ately beyond the valves, nine inches and a third ; 

 at its greatest diameter, eleven inches and a half. 



Our limited time did not permit us to examine 

 the veins. 



vol. in. B b 



