' The .y^^o^rf Effay tteats of the Ufefulnefs oF Mathema- 
to Natural Fhilofophy 5 (hewing, that the Empire of 
Man may be confiderably promoted by the JSaturahfis skill 
in tho[e Sciences^as well Pure as Mixr» 
The TA/V^ proveth the Ufefulnefs of Mechanical DlfcU 
plines to Natural Philofophy, Slewing, that the Power of 
manmay bemuchincreafed by the Naturalifts skill in Me^ 
chanick/ ^ forafmuch as Nature does play the Mechanician, 
not only in Plants and Animals and their parts, but in many 
other curioufly contrived Bodic.% 
The F02^r/Amanifefts, That the Goo^ of Mankind may 
be much increafed by the Naturalifts Infight into Trades : 
for the making out of whichjthc Author endeavors to flis!w 
two things; the^^f J that an Infight into Trades mayims 
prove the Naturalifts\nowledge ; the o/^>^r,thac the Natu- 
ral Philofopherjas well by the skill thus obtained, as by the 
other parts of his knowledge, may be enabled to improve 
Trades ; and this partly by increafing the number of Trades 
and adding New ones 5 partly^hy uniting the Obfcr vations 
ond Pra<9:iles of differing Trades into one Body of C^IUilu 
ons ; partly^ by (uggefting improvements in fome kind or 
other of the particular Trades. And here we cannot but ob- 
ferve,ihac our Noble Author takcth particular care in the 
Preamble to this Book, very fully to anfwer the objedlion, 
damoroufly prefled by fome,as if Tradefmen were injured 
by difcovering tbo^^ things, which are called the Myfteries 
of their Arts. 
The Fifth maketh it outjThat that may be done by Phyfi^ 
i^i^/knowledgejwhat is wont to require Manual skill^or^that 
the knowledge of peculiar QualiticSj or Ufes of Phyfical 
ihings^may enable a man to perform thofe things Phyfical* 
ly^that feem to require Tools and Dexterixy of Handj> pro- 
per to Artificers. 
The Sixth arid laft rcprefents Mens great Ignorance of the 
Uf^s of 2V<3/«m/ things • or^ that there is Icarce any one 
thing in Nature, whereof the Ufes to humane Life are yet 
throughly linderftood ; which is done, both to rouze up 
the 
