(375) 
which are ptrkStly well wrought and well polilht. Thofe, that' 
have tried them , find them very good 5 but they are only, the one 
of 1O5 the other of 8. foot. A good Aftronomer told me, that 
they would bear a great Aferture iniefpedi of their length, . 
rdo not well know, what to fay to yours concerning M.Beve-. 
Urn, Mean whiki, the intereft of truth , and the obliging manner^ 
Jie has treated me with , engage me to anfwer him , in the matter: 
of the Comets : I am perfwaded, I ihall convince him 5 but lince he 
hath taken the illu firms Moyal Society lor Judge ^ J accept that 
with all my heart, 
A Relatiorr 
of the lofs of the Way to prepare ty 
for fhimng, \ 
Though feveral Perfons have pretended ta know the Art of 
preparing and calcining the BononianStonQ^ for keeping a while 
the Light once imbibed yet there hath been indeed but one , 
who had the true fecret of performing it. This msm Ecclefia (lie ki^ 
who 'is now dead without having left that skill of his to any one^ 
as Letters from /^/i/)' and .Fr^;^r^ 3 fome while flnce , did inform. 
There is no fubftancc, in Nature^ known to us, that hath the effed 
of this Stone ^ fbthat (to the fliame of the prefent Agej this 
Fhammenon is not like to be found [ ^ j^j, notwithftandirrg 
anV where 3 but in Books, except (wiikhalfoa-lateLetcer from abroad 
fome happy G.;..^ light upon the t:,^^^^:^:'^ 
fame or the like skul « , fecurcd this Ssaet. ] 
A Defcription. 
of a Swediih Sto;j€^ which affords Sulphur^ Vitriol^ . 
Allum, and Minium. 
This was communicated to the\R. Society hy Sir Gilktt l'aWot 
Knight 3 a Worthy Member of that Body , as he had received it 
in Denmark , being his Majefties Extraordinary Envoy there ^ as 
follows^ 
THere is a Stone in Sweden of a Yellow Colour , intermixed 
withftreaksof white ( as if compofed of Gold and Silver) 
and heavy withal. It is found in firm Rocks :> and rims in Veins,, 
npqo 
