C $oot ) 
By this method be affirms to have laid open even the /malleft 
ramifications of the Arteria hepatica^ that cannot be bared^)£ 
the flelhj arid that are poffibly more in number, tban ibofe of ^ 
ihQvena porta zndcava^Mlto^tihtti 
mrrhree Letters ^ Jo.Dcminicus CaffinuSj comerning his Hypa* 
tbefis iif the Sms motion^and bis doSrine ef ^fra&ionsi^frintedat 
Bononia in 4^ 
THE fifftLttttv h in Latine^tb Geminian Montahariuf^pnh* 
lick profeflbr of Mathematickt in Bonomenji Arcbigym^ 
nafio i who was ealeulating Ephemeridesof the Suns place, 
according to che /<j^/ffr Hypothefis oiCaJJinMf. His formQt Hypo^ 
ghejis was grounded uponGblervations of the Sun-^from whofe 
Alcitudes.wheD they weregreatjbe made no Abatement 5 be* 
caufe^according to the common opinion, the Refraftion is no* 
thing,or,at leaft.inconfiderable^A fpesimri of itj was,publiflied 
about 1 6 years^go,But afterward he changed that Hypethefit^ 
that it might agree with his obfervations as diligently madejbut 
more artificially eorrefted. For, having ex merk jteUs Polam 
altitudinibus ex4^ijfimis determined the height of the pole (and 
thereby of the Equinodlial,) at Bononia % he obferved alfo the 
Suns meridian height in both Solftices. And fubtra^ing that 
^inter'height from that Equino<ftials height 1 and the faid Ef 
quinofiials height from the Summer height^ he alwaies fouod 
that former difference lef$,by above four minutes and an half^- 
than rhc latter difference. Wherefore he attempted to order 
the Parallaxes and Refrad^ons fo, asthat thofe Summejr^and 
Winter. observations^ beings corre died' according to that do* 
<fl:rine, might yield the Suns Southern greatefi declination, e- 
qual to the Suns greateft declination Northward. Injhis Lctr 
ter he fets down^What courfe he took to find the Refradiqnsi . 
What Experiments he n^de in glas and in water ^ How he ap^ 
j^ied them to celcftial Refraftions 5: His proceeding to. deter?* 
mine the proportion of the height of the Airto the Scmidia* 
.jmetersofthe Earth ; And atlaft to make Tables adfingulosfm* 
dm Appauntis ii^anim tw^ make it evrdenr, 
that RifraHionej eiiam in afiivif altitudimbm /wit fen/tbi 
mriicem ufjmi^ot^eendunt i ; which Aitherco hath alwaies been 
denyed-Not^only his frieBds-in Italy^pprove,tbe^ 
la France ^(o* fmus THit infjmlare opere^fuod DE NVPEJ^ 
