36 
Mr. Heys, of Hazel Grove, read a Paper “ On the Kalo- 
scope,” his newly invented instrument for the use of coloured 
light in the examination of objects under the microscope. 
This the Author effects by two sets of four discs each of 
differently coloured glass, 2-| inches in diameter, mounted on 
a stand 12 inches high, one set of which is placed between 
the light and the bull’s eye condenser, and the other between 
the light and the mirror, underneath the stage, each disc 
having an independent motion, so that the light can be 
transmitted through one or more of both sets at the same 
time ; when the object appears of the colours refracted and 
reflected through the discs. 
One of the important uses of the instrument is the protec- 
tion of the eye from injury occasioned by the use of common 
artificial light. 
Many objects which do not polarise, by the kaloscope are 
made to disclose the beauties of polarised light; for instance, 
the anthers of the mallow, with their pollen, when viewed by 
means of red light below the stage, and at the same time 
green light (the complementary colour) through the con- 
denser, appear of a beautiful green colour on a red or crimson 
ground. 
The Author observes that some objects, viewed by 
means of the kaloscope, appear in such relief that they might 
be supposed to be seen through a stereoscope ; these are 
anthers, jointed hairs, oil-glands, and vegetable sections in 
general. The calyx of the moss-rose is alluded to, under 
ordinary illumination, as a mere entanglement of fibres with 
dark beads ; but by this method it is transformed into a 
stereoscopic branch, with glittering glands at its extremities. 
Sections of wood, spines of echini, &c., will be found as 
beautiful as with the polariscope ; but, by another arrange- 
ment, details are brought out not observable with the latter 
instrument. A black surface being placed below the stage, 
coloured light is thrown very obliquely from the mirror, and 
