(22T3) 
itiofl difFertnt and grieifous Symptoms, that were ohkrved in the fick 
people at Lelden^ may be rationally derived ^ adding thereunto his 
Opinion of the Caufe, why Rich and Delicate perfons wcrefirflof 
all and fooner attacked and deftroyed by that Difeafe, then thofe of 
the Poorer and Hardier fort of people; though thefe latter fell in 
greater numbers about the end of this Sicknefs, than the former. 
In the difcourfe about the ill effedis of a tainted Air upon Human 
Bodies, he taketh occafion to infinuate , That as ^tis difficult to 
prove, fo*tishard to deny, that fome part of the infpired Air is 
aifo commixed with the x5*/«//t;^, and being together with other Hu- 
mors, falling from the Brain and its Glanduls and the glandulous 
Tunicles, derived to the Mouth and Throat, and fo fwallow'd to- 
gether with the fame, caufethin the Stomach and fmall Guts feme 
a^lwatians in the humors there found or meeting together. But as 
fee thinks this not improbable, fohejudgcth, that there are yet re- 
q,uired many accurate Obfervations to clear up and eftabiini fo ob- 
feure a Doftrine. 
¥• HTPOTHESIS PHTSICAnova, five THEORTA 
MO TVS CeNCRET I^mAcum THEORIA MOTVS 
A B ST R A CT I, Amh, Gothofredo Guilielmo Leibnitio , 
V. D, & C&nfiliario Mogmtim. Londini Z»?/?^;?// Joh. Martyn, 
R.U Sociemis Tyfografki ^ ad injigne Camfanm in Cosmeterio D-'Fml^^ 
1671, in I2». 
T He Ingenious Author of this fmall Trad, though by profeilron 
a Civilian, and one of the Privy Counfel of his Eledorai High- 
m(so( Maintz, and upon that Accompt very much' taken up with 
pubiick affairs, is yet fo much pleafed with the ftudy and fearch of 
Nature, that whatever hours he can redeem trom his State-employ» 
fnent, he fpends' in that which he judgeth incumbent upon him as 
Ma^, I mean th$ Contemplation of the works of God and Improve- 
n?ent of Natural Philofophy. What he hath therein performed, he 
imparts 11^ this /?)'/><?^/7<f/x to the Learned world, and dedicateth it to 
th? Royal Society of Englt^nd^ and the Royal Academy o{ Fra^^ce^dciireus 
in his. Letters to have their thoughts concerning the fame -, wherein 
he maketh it his buGnefs to ihew, that by ^the help of it the CaKfes o^f 
raoft of the fh^mmena of Nature may be rendred from^one fingle and 
univerfa! Motion, fupposM in our Globe, neither croHing thtCo^ 
fMnican nor Tychonian Hypothefis ^ the Author having fo managed tte 
whole, a^. that all Seds may bean and admit what he here producech^ 
without a prefudice to their own Opinions* 
A Copy of tijis Trad-being Communic-ated, b^fides others, to the 
Ixcellentpr'-; Walmy f ello w of the R.Society-^ and S4Vilia:^ J?rohSor 
Geomett.y int thtrttiiiverfity Q^Oxford, .wish a.defe iq: eismioe the 
