30 PHILOSOPHICAL TRANSACTIONS. [anNO 1744. 



A Catalogue of the fifty Plants from Chelsea Garden, presented to the Royal 

 Society by the Company of ^apothecaries, for the Year 1741, pursuant to the 

 Direction of Sir Hans Sloane, Bart., &c. By Joseph Miller. N''472, p. 75- 



This is the 20th publication of this kind, completing the number of 1000 dif- 

 ferent plants. 



An Easy Method of procuring the true Impression or Figure of Medals, Coins, 

 i^c. By Henry Baker, F.R.S. N°472, p. 77- 



The first step is, to take a perfect and sharp impression, in black sealing-wax, 

 of the coin or medal you desire the picture or figure of: when this is done, the 

 chief trouble is over, and the rest of the operation may be executed at leisure. 



Cut the wax away round the edges of the impression, with the point of a pen- 

 knife, or a pair of sharp scissars ; and, having ready a preparation in gum-water 

 of the colour you would have the picture, spread your paint on the wax impres- 

 sion with a small hair-pencil, observing to work it into all the sinking or hol- 

 low places, those being the rising or projecting parts of the medal, and what only 

 are necessary to be laid over with the colouring ; for it must be entirely taken 

 away from every other part before we can proceed. 



The way of getting off the paint from the places where it should not be, is to 

 moisten your fore-finger a little, but not too much, with spittle or water, and 

 pass it gently, but nimbly, over the surface of the wax impression ; wiping it each 

 time on a cloth or handkerchief, till you perceive all the rising parts of it perfectly 

 fair and clean, and the letters and sinking parts of it only coloured. 



This done, take a piece of very thin post paper, a little larger than the medal ; 

 wet it in your mouth, or with water, till it be moistened quite through, but let 

 not any water hang to it : place it on the wax impression, laying on the back of 

 the paper 3 or 4 pieces of thick woollen cloth, or flannel, about the size of it. 



You must have a couple of flat smooth iron plates, about 2 inches square, and 

 ^ of an inch in thickness. The wax impression must be placed, with its 

 face upwards,, on the middle of one of these plates, before you spread the paper 

 and flannels on it, and the other plate must immediately be laid over them : then 

 holding all tight together, put them carefully and evenly into a little press, made 

 of two iron planks about 5-^ inches long, l-j- inch wide, and half an inch in thick- 

 ness, having a couple of long male screws that run through them, with a turn- 

 ing female screw on each, to force the planks together : and these female screws 

 must have strong shoulders, to work them by. 



Things being thus adjusted, hold the press in your left hand, and, with a little 

 hammer, strike first on the shoulders of one screw, and then on the shoulders of 

 the Qther, to bring the planks together parallel, and render the pressure every 



