286 
SCIENTIFIC NEWS. 
besides an introduction of 33 pages, on the origin and progress 
of dyeing and calico-printing, a preface of 18 pages, and a 
full index of 33 pages, with tables of contents to each volume. 
London 1813. 
In the year 1 *g4, Dr. Bancroft, who has been long known 
and respected by philosophers and manufacturers for his useful 
researches and discoveries, published his “ Experimental 
Researches concerning the Philosophy of Permanent colours/' 
&c. in one volume, which has since become extremely scarce. 
The numerous advances made in chemistry since that time have 
rendered it impracticable to compose a second volume and 
connect it with the former $ for which reason the author has 
thought fit to compose a r.ew and extended edition of the 
whole. He has generally used the language of modern 
chemists $ but objects to the new metals of Sir H. Davy, as 
being improperly classed along with denser bodies already 
denoted by that term, and while he doubts whether the 
chlorine of that chemist be a simple or compound body, he 
thinks Prieur’s term of murigene would be preferable to 
chlorine if a new denomination were required. He has 
divided his work into four parts. Part 1 . Treats of the per- 
manent colours of natural bodies, their composition, the 
various colouring matters, and those colours which being 
fixable by themselves he calls substantive; Part 2 . Relates to 
colours which require a basis or mordant, and are by him 
denominated adjective. He treats of all the several bodies in 
the animal and vegetable kingdoms, of this class in this and 
his third part, and in Part IV he discusses the subject of com- 
pound colours. 
Mr. W. Henley, Member of the London Philosophical 
Society, is preparing for the press, a series of chemical tables, 
which will exhibit the properties of all the present known 
bodies, the result of their union, the composition of the Oxides, 
acids and their compounds, with the effects produced by the 
action of heat, light and electricity 5 so that the whole shall 
form 
