SCIENTIFIC SUMMARY. 
417 
depicted ; but we are unacquainted with the peculiarities of its construction, 
although so far as its form is concerned we presume there is little that 
is new. 
PHYSICS. 
New Lantern Polariscope. — A polariscope which is of such a character 
that it can be adapted to any ordinary magic lantern without involving 
the expense of sending the instrument to the optician, has just been intro- 
duced by Mr. Samuel Highley, of Green Street, Leicester Square. The 
instrument is figured below. The constituent parts are mounted on a 
“ gout-board support.” The upright is fitted with an adjustable panel that 
carries a bundle of glass plates on one side and the stage and power on the 
other. When adjusted, the panel is clamped by means of a milled head 
screw. The bundle consists of such a number of thin glass plates as will 
give a bright reflected beam of polarised light, and is attached to the panel 
at the proper angle for producing such a beam. The spring stage for carry- 
ing selenite designs, unannealed glasses, pressure, and heating clamps, and 
the larger objects, is formed within a large tube attached to the front side 
of the panel ; and to the front of this is screwed a spring jacket, within 
which slides the power and stage for the smaller crystals employed. To 
the front part of the face-board an adjustable rod is fixed that carries the 
analyzer, which consists of a large prism made expressly for the purpose 
of giving a large and pure field of colour, the absolute field attainable being 
of course dependent on the intensity of the source of light employed. We 
believe this was the instrument used by Mr. Highley at the late conver- 
sazione at University College, and from what we have seen we can speak 
in the highest terms of its powers of work. 
highley’s new lantern polariscope. 
The Spheroidal Conditions of Liquids at Common Temperatures is now 
receiving considerable attention, both in this country and on the Continent. 
Among those foremost in the list of investigators we may mention the 
names of Meunier and Tomlinson. The latter has written several able 
