II- T^^ Humane Allantois fully cfifcovered.ancf the 
Reafons affigned why it has not hitherto been 
found cut^ even by thofe who believed its Ex- 
iflence^ With an Anfwer to their Ob jettons 
^ who den) it ^ill. By Rich Hale, M- D. of 
Trinitf College in Oxford Communicated to 
the R. S- by Edward Tyfon. M. P. 
No point in i4//<^^<?/i?y/ has been, and ftill is, more c^^ 
troverted by the greateft Matters of it, than the 
Exiftence, Shape, &c. of a Humane AlUritois. I (hall 
therefore give a true and exadt account of it, as it ap- 
peared in two fub^efts, ftill by me. One of which I ob- 
ferved fever ai years ago, and the other ( Fig. ift. ) ia 
March, 169^. 
But before I do this, it may be convenient to (hew,that 
no Anatomift had hitherto made an entire difcovery of 
this Membrane ^ and to take notice of the difficulties that 
have hindred fuch a difcovery, even by thofe wlio be- 
lieved the Exiftence of it ^ and afterwards anfwer the 
objeftions of thofe who ftill deny it. 
Moft of the Antients indeed allow a Humane Allantois^ 
not from their experience of it, but becaufe they took it 
for granted, that Men and other Animals were alike, in 
the Vifceray Membranes^, ^^Jf^l-^o Hence Hippocrates 
fays, tliat Twins lie in Sinus's^ and that the Uterns has 
Cornna. Galen deftribes the Navel-jlrhg to confift of four 
Veflels, beiides the Urachas^ and the Allantois to be like 
a Pudding reaching from one Grr/w of ihQ Uterus to the 
other. In (hort, notwirhftanding the Antients might r^jCeiftfs. 
fometimes diffed Humane Bodies^ and although a') 
Herophilus and Er^fjiratus did open live M^m and Women,' 
yet it can't be found what great ufe was made of thofe? 
Rrrrr op- 
