Microscopical Essays. 9 



different modes which have been defcribed for making them, that 

 he may be enabled thereby to verify or confute the difcoveries 

 that have been faid to be made with them. 



Take a J mall rod * of the cleared and cleaned glafs you can 

 procure, free, if poffible, from blebs, veins, or fandy particles ; 

 then by melting it in a lamp made with fpirit of wine, or the 

 pureft and cleared fallad oil, draw it out into exceeding fine and 

 fmall threads ; take a fmall piece of thefe threads, and melt the 

 end thereof in the fame flame, till you perceive it run into a fmall 

 drop or globule of the defired fize ; let this globule cool, then 

 fix it upon a thin plate of brafs or filver, fo that the middle of it 

 may be direftly over the center of a very fmall hole made in this 

 plate/ handling it till it is fixed, by the before-mentioned thread 

 of glafs. When the plate is properly fixed to your microfcope, 

 and the object adjufted to the focal didance of the globule, you 

 will perceive the object didinftly and immenlly magnified. By 

 this means, fays Dr. Hooke, I have been able to diftinguilh the 

 particles of bodies, not only a million of times fmaller than a 

 vifible point, but even to make thofe vifible whereof a million of 

 millions would hardly make up the bulk of the final left vifible 

 grain of fand ; fo prodigioufly do thefe exceeding fmall globules 

 enlarge our profpeci into the more hidden recedes of nature. 



Mr. Butterfield, in making of the globules, ufed a lamp with 

 fpirit of wine • but inftead of a cotton wick, he ufed fine filver 

 wire, doubled up and down like a fkain of thread, f He pre- 

 i B pared 



* Leftures and Colle&ions by Dr. Hooke. 

 t. Philof. Tranf. No. 



