PRIXCIPIA. 13 



service w:i* rendered TO stu^on:* 1 y :bc ab e :v;ui lc:vrr.o-.i 

 commentary of the Fathers, Le Seur and Jacquier, who, 

 in 1739 and 1742, published the Principia, with very 

 copious illustrations, although it is to be regretted that 

 they resort far less frequently to analysis than was de 

 sirable. It is remarkable enough, and affords an addi 

 tional proof of the slow progress which truth had then 

 made in some parts of Europe, that these excellent authors 

 deemed it necessary to accompany their publication of 

 the Third Book, which treats of the heavenly motions, 

 with a declaration in these words: &quot; Xewtonus in hoc 

 tertio libro Telluris motae hypothesim assent. Autoris 

 propositiones aliter explicari non poterant, nisi eidexn 

 quoque facta hypothesi. Hinc alienam coacti sumus 

 irerere personam ; ca^terum latis a summis Pontificibu? 

 contra Telluris motum Decretis nos obsequi profitemur. &quot; 

 This edition is dated, as might be supposed, at Rome.* 



The Principia begins with a definition of terms, and 

 a compendious statement of HA science of dynamics as it 



e\isu\l prevun;? :- N OY : oil s 4bBMtrilft The Mbi&MM!, 

 eight in number, comprise that of quantity &f waiter* 

 which is in the proportion of its bulk and density, the 



ile:i&amp;gt;i!Y Ivi-p; the pMfOHlMI ^:&quot; : .:&amp;gt; :r.:*s&amp;gt; :^ : .:&amp;gt; bulk ::.e 

 pHQB| : * &quot;&amp;gt; * &quot; -^hieh i&amp;lt; in projx&amp;gt;rtion to^kfl &amp;gt;ehv::y 

 and quantity of matter jointly the rw wri^p, whkh is 



* It Mst, IWWVTW, be otaarrca, tfudt s*A ^gotsy *n d mtoicwmco 

 by d*o imimfcuam t tte tJiaViMi^ to ptV&k % 



V-.--.-;..--. ^.:&quot; :..&amp;gt; : ;.-.-.;.-.&amp;gt;;. .;/.; :-.; .-.:\ o1 the ;v,v;&amp;gt;. ;. --.v.y.v; : . -. .^.vc. ^&amp;gt; ; ::...&amp;gt;... . 

 |fc| \ ; r\ :.- ::-.v- .\ .; which :.:~..\ ft&amp;gt; rc*A&amp;gt;Yi^Wc :. ..-.-.:..-,:.. -. ^&quot; ; - ,. s ; ; 

 A!A&amp;gt; to wontion, for the credit of the I^I-VA! G-ovornme-nt, tht * Ute pMrtMP 

 ^IV.s Vll.&amp;gt; j\nvwwsl A K-ixuU of tix? ik^cTce Ag^^st the Cojxsnakaua sygMHk 



