DIFFERENT SYSTEMS. 99 



* nica abdudum, quod fubftat duabus commurii- 

 ' bus toti ovo membranis,' &c. Hence the only 

 dil'covery proper to Harvey confifts in his re- 

 marking the exiftence of this cicatrice, both in 

 fecundated and unfecundated eggs ; for the o- 

 ther writers had obferved, as well as he, the di- 

 latation of the circles, and the growth of the 

 white point., Thefe are all the remarks Harvey 

 has made in his account of the two firft days of 

 incubation ; what he mentions concerning the 

 third day is a repetition only of what Ariflotle 

 delivers in the fixth book and fourth chapter of 

 his hiftory of animals : * Per id tempus afcendit 

 jam vitellus ad fuperiorem partem ovi acutio- 

 rem, ubi et principium ovi elt et foetus exclu- 

 ditur ; corque ipfum apparet in albumine fan- 

 gulnei pundi, quod pundum falit et movet fe- 

 fe inftar quafi animatum; ab eo meatus vena- 

 rum fpecie duo, fanguine pleni, llexuofi, qui, 

 crefcente foetu, feruntur in utramque tunicam 

 ambientem, ac membrana fanguineas libras ha- 

 bens eo tempore albumen continet fub meati- 

 bus illis venarum fimilibus; ac paulo poft dif- 

 cernitur corpus pufillum initio, omnino et can- 

 didum, capite conipicuo, atque in eo oculis 

 maxime turgidis qui diu fic permanent, fero e- 

 nim parvi fiunt ac confidunt. In parte autem 

 corporis inferiore nullum extat membrum per 

 initia, quod refpondeat fupcrioribus. Meatus 

 autem illi qui a corde prodeunt, alter ad cir- 



(j 2 ' cumdantcm 



