222 DESCRIPTION of a 



aorta to the veffel which accompanies the continuation of the 

 umbilical veins ; but fpeaks of his aorta as afcending from the 

 thorax to the head *, and fending off the fubclavian and the 

 carotid arteries ;- and remarks, that canals proper to the latter 

 were wanting f. And he obferves, that the aorta, after de- 

 fending, as ufual, between the crura of the diaphragm, gave 

 off the mefenteric, renal, lumbar and iliac arteries ; and that 

 the left iliac artery fent off an umbilical artery ; and concludes 

 his defcription in the following words : " Ita, quidem, fi arte- 



" rise umbilicalis dextrae, arteriasque caeliacse defeclus ex- 



" cipiatur, vix ab ufitata fabrica aberrans arteria aorta in abdo- 

 " mine diftribuitur." 



After an elaborate defcription of the feveral parts of the 

 monfter, Dr Roederer propofes the caufe of the motion of 

 its humours, in the following words : 



P. T89. " Motus qui — humores agitat, caufa indagatur. 

 " Aft aliquis, lentus licet, fcetus parafitici humores motus 

 " agitavit. A corde, fueto motore, repeti ifte motus nequit, ne- 

 " que multum auxilii propulfus in uterum maternum fanguis. 



" ferre poteft. Prseter vero iftum, levem, debilemque. 



" Ipfa vaforum actio, five contrahendo agat, five attrahendo, 



" vi 



* P. J 21. " Arteria magna, quam aortam vocant, ex abdomine in thoracem afcendit. 

 In thorace eandem pene directionem fervans, nulloque cum. corde canali confluens, fola et 

 a corde diftincta, iter fuum ablolvit. Nullus proinde ex aorta arcus formari poteft, fed. 

 laterales rami ex reclo aortae trunco emittuntur. Sunt ifti rami qui dtfcripti fequun- 

 t'jr. 



In regione coftae prima; leviffime defcendentes arteriae fubclaviae nafcuntur ; ex quibus. 

 vicifnm triplex alia ramorum fpecies oritur, qnarum primus ad cervicem, &c. Porro 

 truncus aortae per femipollicem poftquam progreflus eft in duos ramos dividitur, duas 

 nempe arterias carotides, quae ad altitudinem laryngis fine infigniori ramo afcendunt. 

 Afcendit, autem, carotis dextra, &.c. Ad latus tandem laryngis canalis commu- 

 nis in fex omnino ramos dividitur." 



f P. 143. "Canalis pro arteria carotide deeft. Carotis per amplum foramen lace- 

 rum ad cerebrum tendit." 



