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Exhibition of 1851: Mcnthly Rport of Progress.               03 
4. Colour is used to assist in the developement of form, and to distinguish
objects, or parts of objects one from another. 
5. And to assist light and shade, helping the undulations of form by the
pro- 
per distribution of the several colours ; no artificial shadows ever used.
6. That these objects were best attained by the use of the primaries on.
small surfaces, or in small quantities, supported and balanced by the 
secondary and tertiary colour on the larger masses. 
On a future occasion we will venture to pass in review some of the orna-
mental works now in the Great Exhibition of the Works of Industry of all
Nations, and see how far these principles may be applied to them; happy,
if 
we can but add our mite to the great granary of knowledge which this 
enlightened age has heaped up for the instruction of the present and benefit
of 
future ages. 
VITREOUS GLAZE FOR EARTHENWARE. 
IT has long been a subject of regret with manufacturers of porcelain and
earthenware, that the best compound which they can obtain for a glaze contains
so large a portion of lead as to render it injurious to the health of the
work- 
men using it. Up to the present time all attempts have failed in producing
a 
glaze which would flow as readily, produce as hard a surface, be as good
a 
colour, and assist delicate tints to the same extent as the common lead glaze.
Mr. Rose, of Coalport, produced a glaze some years since in which the use
of 
lead was abandoned, but it fell into disuse. Mr. Grainger, of Worcester,
has of 
late manufactured some chemical apparatus glazed without lead, and which
are reported to have resisted the action of chemicals to a greater extent
than 
any hitherto produced. We desire now to call the attention of our readers
to 
a glaze which has recently been discovered by Mr. Walley. This is stated
not 
to involve the use of any of the known bodies employed in the production
of 
fluxes,-such as lead, borax, soda, glass, or any salt or alkali,-but is simply
a 
compound of earths. From the specimens of ware which we have examined, 
it would appear to possess advantages peculiar to itself, as it not only
admits 
of the ware being dipped in the clay state, when one fireing is a convenience,
thereby saving the second fireing for glazing, but also induces the use of
a new 
and better coloured dip for common earthenware, as it is much cheaper than
that ordinarily employed. The weight of the glaze at present used by manu-
facturers weighs from 30 to 31 oz. per pint, and when dried about 20 oz.
of 
solid matter are obtained; whereas that discovered by Mr. Walley weighs only
25 oz. per pint, and when dried not more than 7 or 8 oz. of solid matter
are 
obtained, thus rendering the glaze thinner and more transparent in its character.
EXMBMON OF 1851: mONTHLY REPORT OF PROGRFH5. 
ON the 1st May, punctually to the very day announced so long as sixteen 
months before, the Exhibition was opened and submitted to the criticism of
the world. There is no feature in the whole Exhibition more satisfactory
than 
this punctuality, attained under extraordinary difficulties, and reflecting
much 
credit on all the parties who have contributed to the result. It was not
until 
the last moment that our foreign guests believed that we were serious. The
Englishman accepts their compliments on the punctualitg nationade with bland
coolness, as though it were a matter of course. From the earliest period
we 
have always expressed confidence that this appointment would be kept, and
certainly the fact has been universally accepted as a proof of no common
generalship-generalship, too, over forces which were volunteers! 
If in the progress of this great work there has been a little friction, it
is 
now altogether forgotten in the brilliant success of the Exhibition. The
task 
was a great one, and even some failures would have been excused; but the
success hitherto has been quite unmixed, and has surpassed all expectation.
Perhaps never since the world begun have so many well-satisfied faces been
assembled together as are now daily congregated in the Crystal Palace. Every