410 On the Porcelain Clay and Buhr-stone 
Pilling, who stated “ that the stones were not quite so uniformly: 
porous as the sample buhr, and had rather chipped in faeing ; 
that they meuded of this every time they were faced, and were 
evidently tougher the longer they worked.” 
[N. B. It is intended to send up Mr. Pilling’s own report, by 
way of supplement, as soon as it can be procured.] 
In September 1820, a pair of Halkin milistones was put up 
at the Aughton water- ‘mill, near Ormskirk, Lancashire, occupied 
by Mr. Richard Rawsthorn, sen,, who has been a practical miller 
all his life, and is 74 years old, and he states, that ‘‘ they an- 
swer better than French, for they ‘grind cool, and make fine flour, 
cut bran thin and broad, ‘and crack as fine as any French stone.’ 
In September 1820, a Halkin millstone was also put up at a 
new windmill at Knotty Ash, near Liverpool, and Messrs. Marr, 
the tenants, declare that « they laid down a pair of French buhrs, 
and a short time after laid down a French and Halkin; that the 
latter work equally well as the French; stand cracking as well, 
have been dressed four times, and still improve; soften the wheat 
as well or better than French do, and cut very broad bran, and 
preserve the colour as well as any French stone.” 
In October 1820, a pair of Halkin millstones were sent to 
Messrs. Hudson and Co., of the King’s Mills, Leeds. By a let- 
ter from them it appears the stones are not yet in use, so that 
no positive proof can be had of their grinding ; but they say 
“‘ that their millers who have prepared the stones for work (from 
which they can form a good opinion of their qualities in com- 
parison with French buhrs) give them a favourable opinion that 
they are likely to answer.” 
In November 1820, a pair of Halkin millstones were consigned 
to Richard Robinson, Esq. of the Phoenix Iron Works, Dublin ; 
but they were delaved for along while by stress of weather, and 
have not yet heen put to work. Mr. Robinson, however, says 
that “¢ they have undergone a very close examination by some 
of the first miilwrights and millers, who all agree that they ap- 
pear equal to the French buhrs, and in some instances superior,” 
alluding (it is supposed) to the equability of the pores. 
In December last, Richard Sankey, Esq. .» banker in Holy- 
well, Flintshire, and owner of a large windmill there, having a 
pair ‘of French milistones which did not give entire satisfaction, 
.removed the runner, and put up a Halkin millstone in liet of it, 
and he certifies, that ‘* his tenants like the work done by these 
better than by the other pair of French stones in the mill; that 
they clean the bran better, that the flour is soft and of good co- 
lour, and the stone keeps its face well, and gives satisfaction in 
all respects.” 
The discoverers beg permission to declare further (and are 
ready 
