C 568 ) 
which is equal ro the number of theSand^capable to fill up not only 
the whole Earthand its cavities, but alfothe whole World* 
'Vfo this Trad of the Mumber of iht Sa^td, is iddtd that other 
of the fame Archimedes^ touching the Dimenfiof^ of a Circle^btc^ufe 
'tis fcveral cimes quoted in theformer^as the foundation of his (7^/- 
€ul^ ; nor did n want emendation. To it is zmtKtd Eutocius his . 
lliorc Commentary upon the faid Dimenfion, which exhibits a Spe- 
cimcn of the form and manner, wherein the later Greeks were wont 
ro write their Comments upon their more ancient Authors ; and 
lliews withal,how laborious it was to make Multiplications, Divi- 
uons,and Extraftions of roots before the ufe of the IndiAn Cyphers 
was introduced, as a'fo after what manner they were performed. 
II Objervationes MedkacircA iMORBORUM jiCUTORUM 
HISTORUM EI CURAllONEM; ^«^A.Tfioma Sydenham 
M. D, Londini, h^^. 
The Author of this Treatife, aiming principally in his Pradife 
of Phyfick to contribute what he can to the real and conflant cure 
of all Difeafes , and being well aware of that great dejideratum in 
Phyfick of faithfully recording fuch Medical Obfervations and Me- 
thods of Cure, as by candid and careful Phyficians are made , and 
with fuccefs employ 'd,refolved at length,after many folicitations of 
thofe of his Friends that knew his Praftife, and his conflant endea- 
vours of improving the fame for the common benefit of Mankind,to 
publifh thefe his Obfervations, relating to the Hiftory and the 
fuccefsful ,and certain Cure of Difeafes, waving therein all 
Philofophical Bypthejes , and delivering nothing bat genuin mat- 
ter of Fad ; diftinguifting withal the peculiar and conflant Pha* 
a^^j/w^*;?^ of Difeafes from thofe accidental and adventitious^ and 
very carefu^lly obferving the aptnefs of the feveral Seafons of the 
Year to occafion the feveral forts of Difeafes reigning in them. ^ 
Now this Hiftory and Cure of Acute Difeafe^ Sere defer ibed, 
comprehends his Obfervations of the fifteen lafl years of this Age; 
a competent time, for rendring an account of the diftinfl fpecies 
of Epidemical^, which not only fortuitoufly invade us, bot are.in 
one year, or in a certain feries of years,of one and the fame kind, 
and in other years different from one another. 
To defcend to the particular Matter here performed , 
our Author hath obferv'd , that from the years i66i to that 
of 1676. there have reigned J^r^fevtrai Conftitutions of 
