whey, the lang hardly vifible, the flomach, liver, ae 
and kidnies at together, under: the _appearant “i a 
white jelly;-wh 
few veffels, es on fome kind-of _paflages delineated in ahs 
aunbilical. membrane, than true blood: veflls when i in rte all 
Bagh ss 
ce the 
proportion of the heart to the reft of the body i in the fst is 
very confiderable ; and particularlyfo i in the i ick, 
the heart of which isa little lefsthan the head at the or ‘of the 
fecond day, get thicker than.the —_ body, of which it — 
forms about 1, a t-amore advance eriod 
of foctal a this organ is re very large, and showin 
eft. It is broader-and not 
uently has a more rounded 
> 
a pelea is thin, .ten- 
des, and “oe ots and eafily feparable from the diaphragm, 
e | auricles are larger than the vent =e whereas, af- 
in fize frifberg found the auricles fo dias *in the em- 
ste of three months as to-cover the greateit part of the 
leart, 
ar 
The left ventricle is more advanced in its formation at an 
early period than the right, as. it receives the blood of the 
inferior cava through the foramen ovale and the left : auricle. 
crefcent, formed by the loof 
HEART. 
xeeed the former . 
* courfe of the blood 
the reft of the auricular feptum. Sometimes mufcular fibres 
may be difeovered within the duplicature of the membrane. 
> ie tit isn it gro 
its edge jopenactne the margin of che foraiiees reat and is 
as high as that in the Soak month ; in the. feventh the whole 
embryo 
opening, sad the valve itfelf is one or two lines larger than 
the aperture: hence, when the parts are itr etched , there 
eems to be no opening, but when the valve is left to itfelf, 
it yields towards the left oreger and an elliptical {pace is left 
between its edge an the opening. 
its jane from the left ee only applies it againft the 
margin of the aperture, fo as to prevent all communication. 
At this cise then*the foramen ovale is a fpace included -be- 
tween two concave edges, of which one (that of the anulus 
ovalis) has its cornua turned downwards, the other (that of 
the valve) has them directed upwards. So long as there is 
a preffure from the right auricle, thefemargins may be fepa- 
rated, and fluid may pafs; but when shes tones is equal on 
both fides, the opening is clofed, and the blood does not get 
through, although the margins are fimply contiguous and 
not ad! Seed They do, eetistl in general, adhere foon 
after birt 
- wane Tuite chia is moft perfe& 
in which itis never pic Koti Hence we. conclude that, 
its office is particularly conneéted with the Laem ien 1 
the foetal circulation, Its. ftruéture an 
to afcribe to it the office of conducting the. blood ‘fon the 
inferior cava to the foramen shige and oppoling its entrance, - 
into the right auricle. Hence this valve has been found. un- 
ufually large and ‘ftrong i a the foramen out is open 
in 7 adu it Soemmerring de corporis hum, fab. t. 5. 
fhews that the 
Piel fs AGE RIS 
. 
“The general as ae of ee be for 
the left ; 
t art. In this general ftate t all p fio ogifts agree 5 
> bak fen mig fis ia the ined of inferior cava in pare - 
ticular goes t hrough the nt a while others do not make 
this wegeergg ge account o i, former, which is the 
opin: Sabatier, will be f in the article Circu- 
Beas 
Vas unafual es Cig a in this effential part of 
the circulating fy fo cafes the heart 
hon nentirely wanting, (fee Mem. de PAdsdente des Sciences, 
» where an eer: is mentioned by Winflow, the fame 
pg the year 1720, where there is a cafe by Petit, and 
the Philofophical Tranfaétions for 1809). The details ot the 
Haller ¢ 20 et t anatomy of the s oticient organs 1 in thefe inftances have. not 
fides of the opening in the left auricle, and rated been flated oak Y ME ag 0 Be 
#2 iterval.of about four lines in the foetus at full-time. how the i t gan 
The valve is afold a the internal lining of the auricles, its All the children came into ie world dead 
two furfaces being prolongations of ‘the membran e Amore common kind of seh ar conhitia of: fuch 
Cavities towards which they are placed, being continu- atrangements as produce a mixture of the red ‘and ‘black 
nas and 
©xs with each other at the loofe eee’ “Itis fo 
#8:£0..be. nearly. a and — y differs from 
* 
ae, 
blood, and are’ confequently attended with the moft ‘unfa-- 
yourable effe€is on the general preety OF this kind-are 
openings 
* 
