( 210 ) 
1 8. lt\^ill-ddms^Sea4anksj and the Eulmrks or Walls of 
FortrefTes. 
1 9. In the Compreljion of Wool and other Elafiique Bodies^ and of 
the Jir within Diving VeffelSjas alfo in the Effefts of Screw-prejfes 
upon feveral Materials. 
Having thus emamerated his feveral Inftances, wherein Duplicate 
zr[6 Suh-luplicate Frofortionisoi gxt^t importance, he explaines 
what he underftands by every material word he ufes in this Dif- 
courfe, fuch as Matter^ Body^ Figure y Flace^ ^Ution^ Quantity ^ 
Quality, Jiahit^ time^ Proportion^ Weighty Swiftnefs^ Force and £- 
hjlicity. This done, he falls to his main bufincfs, which is the 
Application of the faid Proportions to each of the refpeftive 
Matters lately men tion*d. To which hefubjoynsan J^PPENDIX 
touching his new Theory of Elajlicityy mechanically explicated,to 
draw forth the Thoughts of other men for Countenance or Corre- 
aion. This Hy pothefis the Author hopes will folve all the Ph^nos 
mena of Elajlicity, and not only fo,but alfo thofe of Hardnefs^Fix' 
ednefSf tenacity^ Fluidity^ Heat^ Moifiure, Fermentation^&ic. Not to 
prejudice this his Explication by transferring it hither in a Brevi- 
at, we fliall referr the Gurious to the Authors own Difcourfe;wiQi- 
ing, that whatever EjfeSts of Springinefs do occur to the Ingenious 
Reader, he would pieafe to examine them by the Principles deli- 
vered by t he Au thor . 
Thefe are the particulars, performed in this Difcourfe, which 
the Author judgeth, may pafs for a Sample, pro tanto, of what the 
Royal Society is doing. For,the faid Difcourfe confifting of three 
parts, viz, i. An Explanation of the Intricate NotionSjOr Philofi' 
phia prima^ ofPUce^ time^Motion^Elafticity^ &c ; 2. An excitement 
of the World totheftudy of theMathematiques, by fiiewing the 
i]fe of Duplicate Proportions in fome of the moft weighty of Human 
affairs^ And j.APropofal of confidering, without Chyinerical 
Speculations, fuch points and properties in Jtomes, as may give an 
Intelligible Accomptof theNexures, Mixtures,and Mobilities of all 
the pans' of the Univerfe: The Difcourfe,! fay, confiding of tbefe 
parts, he efteqms, that in like manner *tisthe profefllon of the faid 
Society^ to make Myfterious things plain 5 to expbde and difufe 
all infignificant and puzling words.; to improve and apply little 
finall threds of Mathematiques to vaft Ufes ; and yet not to negle^: 
the fmeft Confideration, even of Atmes^ where the fame is necelTa- 
^^ • ' ' ' • ■ I 
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