On definite Proportions. 171 
the SW side of that Town. Mr. H. has informed me, 
that some time ago he was visited by James Meadows, Esq. 
of Piccadilly, in Manchester (the very able Agent for the 
Peak-Forest and several others of the Canals near Man- 
chester), who previous to purchasing one of his Models, 
had Mr. Hall out with him, to explain the leading features 
of the strata of the district, and that in this excursion, they 
came to the large Lime Quarries (called Black- hole, ge-« 
nerally) at the head of the Peak-Forest Rail-way (Rep. 1, 
288, 299, and 409), and that here the Ouarriers had worked 
up to, and cut passages through the fault-stuff, leaving three 
great pillars standing, against which the 3d Toadstone had 
abutted, and that Mr. M. was so struck with the import- 
ance of preserving these, as monuments of the existence of 
this great Limestone Fault, that be gave directions, that 
the masses of fault-stuff above mentioned, should on no 
account be disturbed ;—here therefore, Mr. B. may again 
he gratified, by measuring, analysing, &c. whenever it suits 
him, see p. 106. 
Mr. B’s want of candour iz quoting passages, which he 
marks with inverted commas, in several! places, will be 
seen, particularly in p. 124, where he wishes improperly to 
accuse me, of overlooking the ** owtline” character of his 
Geological Map, see p. 56; and he has for this purpose, in- 
terpolated the word only before to trace an outline,”’ &c. 
in quoting from his Geology, p. 255, and in the middle 
of the continuation of this same extract, has omitted the 
words, ** which were it attainable,” &c. although they are 
material words, as referrmg to Mr. B’s assertion, of the zm- 
practicability of making accurate Maps of large districts, 
on which point I have already spoken in this Letter, 
And am, sir, 
Your obedient servant, 
Westminster, Sept. 2, 1813. JOHN FAREY sen. 
XXIK. An Attempt to determine the definite and simple Pro- 
portions, in which the constituent Parts of unorganic Sub- 
stances are united with each other. By JacoB Brrzx- 
Lius, Professor of Medicine and Pharmacy, and M.R.A, 
Stockholm. 
(Continued from p. 142.) 
XXI. Appirion, reLATIve TO OrGAnNiIc Bopigs, 
[Communicated to Gilbert in Manuscript.) 
I HAVE expressed a conjecture in this essay, that certain 
bodies may be capable of lower degrees of oxidation, 
than 
