MEMORANDA. 223 
and to be very troublesome; but such is not the case, for if 
the beaker be placed in a metal bath containing a strong so- 
lution of chloride of lime, or of common salt, and then placed 
over the lamp or fire, it will not require continuous watching, 
and the vessel need only be examined once or twice.—T. G. 
Stokes, Aughnacloy. 
A Telescope Lamp.—Messrs. Murray & Heath exhibited at 
the last meeting of the Royal Microscopical Society a 
telescope lamp.- The lamp consists of three tubes sliding in one 
another, the oil or paraffin vessel being contained in the inner 
tube. Spiral guides being cut in each of the tubes, the height 
‘gi i 
| Hii) 
| 
| 
of the lamp is regulated to the greatest nicety by simply turn- 
ing one tube in the other, the guides preventing all chance of 
slipping. ‘The advantages are compactness, and the absence 
of the stand and bar usually used for raising and lowering 
the lamp, which enables the lamp to be used on all sides, and 
allows of its being brought much closer to the microscope 
when desired. 
VOL. VII.—NEW SER. Q 
