194 
Mr. Hurst made a few remarks on the practical difficul- 
- ties still attending the obtaining of good illumination for 
microscopical purposes, especially where time was an object 
and the illuminator not constantly used, as is generally the 
case. He observed that the light of gas as modified by 
variously coloured glasses was perhaps the most perfect 
light at our disposal ; but against its use might be urged 
the amount of heat given out, and the loss of time attending 
the arrangement of the gutta percha tube necessary for 
conveying it if moveability be an object, its disagreeable 
smell being also an objection. 
The use of Belmontine, Paraffin, and other lamps of a 
similar nature, was rendered undesirable by the difficulty 
of keeping them in order, the fact being that if laid aside 
for three months, these lamps were generally rendered 
useless. These Hydro-carbons were also offensive in smell 
and very disagreeable to handle. 
Mr. Hurst recommended under these circumstances the 
use of the ordinary circular railway reading lamp, which 
gives a good light, is perfectly clean, can be laid aside for an 
indefinite period, and yet be ready for use at any moment, 
while its portability is no slight advantage for sea-side trips, 
or even domestic use. 
