182 
Miscellan eons. 
CAST IRON. 
It has been mentioned that cast-iron, when at a certain degree 
of heat, may be cut like a piece of wood, with a common saw. 
Tne discovery was announced in a letter from M. Duford, direc- 
tor of the iron-works at Montalaire, to M. D’Arcet, and published 
in the Annales de Cninaie. This experiment was tried at Glas- 
gow, on Monday se’nnight, with complete success, by a gentle- 
man of the philosophical society there, who, in presence of the 
■workmen belonging to an ironmonger, cut witn the greatest ease, 
a bar of cast-iron, previously heated to a cherry red, with a com- 
mon carpenter’s saw, in the course of less than two minutes. The- 
■saw was not in the least injured by tne operation. 
NOTICE TO CORRESPONDENTS. 
1 have received a letter signed O. E. on turpike roads. The 
»nly reason why it is not published in the present number, is, be- 
cause I wish to say something on the subject myself, in addition to-.o 
O. E’s paper, for which I thank him. 
An accident has prevented my inserting the analysis of the 
limestones, transmitted to me by Judge Peters. I have to repeat! 
the experiments in consequence of this. I will endeavour to insert 
diem in the next number. 
A correspondent of the Emporium enquires, whether and 
when it is intended to give papers on tne dying of cotton. If I 
continue to conduct this Emporium, I shall endeavor to present 
the information I have collected, in a way as little desultory as 
possible. I know that the generality of readers, love to see a pam- , 
phlet that treats on twenty subjects at once; but as I really mean 1 1 
to make this, if I can, a collection worth preserving, I will not . 
go on in that way, by which no connected information can be given, 
To make a medley of this kind, I have nothing to do but to mark 
with my pencil the essays I choose to pillage from British com- « 
pilations, and give the books to the printer. I will not do this. 
I propose to draw up regular, connected essays on manufac- 
turing processes ; composing, compiling, selecting, abridging, and 
arranging, in the best manner I am able. This trouble I might 
easily save myself by pursuing the common metuod, and make* 
