142 Notices respecting New Books. 
In the Press, 
The Entomologist’s Pocket Compendium: containining an 
Introduction to the knowledge of British Insects; the Apparatus 
used, and the best means of obtaining and preserving them; 
the Genera of Linné; together with the modern method of 
arranging the classes Crustacea, Myriapoda, Spiders, Mites, 
and Insects, according to their affinities and structure, after 
the system of Dr. Leach. Also, an explanation of the Terms 
used in Entomology: a Calendar of the time, and situations 
where usually found, of nearly 3000 species; and Instructions 
for collecting and fitting up objects for the microscepe.  TIlus- 
trated with twelve plates. By Mr.George Samouelle, Associate of 
the Linnean Society of London. 
A Treatise on Medical Logic founded on Practice, with facts 
and observations. By Sir Gilbert Blane, Physician-extraordinary 
to His Majesty. 
A Treatise on Midwifery, developing a new principle, by which, 
it is said, labour is shortened and the sufferings of the patient 
alleviated. By Mr. George Power. 
A new Edition of Lord Bacon’s Works, in twelve volumes fools- 
cap, enriched with portraits, with the Latin part translated into 
English. By Peter Shaw, M.D. 
Preparing for Publication. 
There is now in circulation a Prospectus of a new Work en- 
titled “ The Elements of Radiant and Fixed Matter,” (ready for 
the press, and to be published by subscription, in one volume, 
Svo, with piates, when a sufficient number of subscribers to cover 
the required expense shall have been obtained) containing the 
Direct Evidences in support of the following Theory of Matter, in 
which are described its presumed original basis, with the laws by 
which its reciprocal transition to and from the state of radiance 
and fixation appears to be governed. 
Theory y: —Matter exists in four forms,—the solid, fluid, aéri- 
form, and radiant.—The three first may be denoriiniated inert or 
passive, and to the agency of the last, aided by caloric, are to be 
attributed the several changes evinced throughout the universe. 
Light is a material compound, composed of the four simple 
elementary principles, or undecompound constituents of matter, 
of which all other bodies in nature are formed. 
By a prism, light is divisible into four original prismatic coloured 
rays, which, by obliquity of position, in the act of extended refrac- 
tion, exhibit three others, which, not being intimate compounds, 
may be termed laminar intermediates, partaking of partial colorific 
intensity, as they severallyapproximate that point in the s Baa 7 
where 
Ry 
