490 ESSAYS and OBSERVATIONS 



fo frequent, I was lucky enough to dif-, 

 cover, with certainty, feveral orifices of 

 arteries, fpme of which were of a confide- 

 rable diameter, opening direflly into the 

 finufes : And fince none of the anatomifts 

 have painted or defcribed thefe openings, 

 though, in the imaginary ftruaure of the 

 finufes, they are fuppofed ; I have caufed 

 a few of the moft diftind to he reprelent- 

 cd in Tab. 7. fig, 7. where A reprefents 

 the inner furface of the womb, to which 

 the edge of the placenta had been fixed j 

 ■ — ^<^, two fmall arteries appearing after 

 having pierced the mufcular fubftance j 

 T-cuij their ferpentine and fpiral turns ; 

 — /f, their openings into the finufes; 

 which were plain beyond difpute, when 

 the wax was taken out of the finus, and 

 the artery gently prefied, the finus being 

 again in part filled from it, as is repre- 

 fented at/ w. Nay, it is evident, that the 

 arteries had communications with the fi- 

 nufes alfo in my brother 's fubjed ; fince 

 the placenta was covered over with the 

 extravafated oil of turpentine and vermi- 

 lion, which was injeded into the aorta de- 



fcendQiis-y 



_i ,. 



