106 
POPULAR SCIENCE REVIEW. 
November. Place, says the author, the balsam-mounted slide on the hot- 
plate, and when it is sufficiently warmed tip over the cover by means of a 
needle $ the diatoms will be either on it or the slide, it matters not which. 
Apply over them at once, whilst still on the hot plate, a drop of turpentine. 
Remove the slide to the stage of the dissecting microscope, and add more 
turpentine. Have ready a clean slip of glass, on which has been placed a 
drop of turpentine. In the case of large discoid and other forms, having 
applied plenty of turpentine, they can be easily transferred by means of a 
fine sable-hair brush from the original slide to the pool of turpentine on the 
clean one. In the case of finer forms, it is better to place less turpentine on 
the original slide, collect the diatoms into a heap, allow the turpentine to 
dry a little, and then by a twist of the brush to transfer them en masse to 
the ,new slide. In either case, having got them there, push them together 
and mop up the superfluous turpentine, and then, still under the dissecting 
microscope, slant the slide by placing a piece of folded paper under one end, 
and apply a little benzole, either by means of a clean brush or brass rod, 
immediately above them, that is, on the end of the slide that is raised, and 
allow it to float gradually over them, care being taken that it does not flow 
with too great a rush and carry away the diatoms with it. Repeat this 
process some half-dozen times, till the whole of the turpentine and balsam 
has been washed away, and till the valves are left dry and black after the 
benzole is evaporated. They can then be transferred in the usual way to 
any other slide, and even with greater ease than from an ordinary dry 
gathering. 
Scales on the Body of Culex. — Mr. Jabez Hogg has an interesting paper in 
the “Monthly Microscopical Journal ’’for October on this subject. Hesays that 
the body of Culex annulatus is entirely covered with alternate rings of dark 
brown and white-coloured battledore scales 5 and the hairs projecting from 
its sides are longer and more numerous than in C. pipiens or C. musquito. 
The “feathered antlers ” pec,tinat§ antennae of the male insects, although 
destitute of scales, are exceedingly handsome objects: they surmount the 
most brilliant set of compound ocelli it is possible to find. In short, he 
wears finer clothes and is better dressed throughout than his female com- 
panion. When the piercing apparatus is sent into the flesh of a victim, the 
proboscis appears to divide ; it is then thrown up and turned back upon the 
head like the trunk of an elephant. 
Microscopical Papers of the Quarter. — The following is a list of the 
several papers which have been published in the “ Monthly Microscopal 
Journal ” of October, November, and December: — “A Rare Melicertian ; 
with Remarks on the Homological Position of this Form, and also on the 
previously-recorded new species Floscularia coronetta.” By Charles Cubitt, 
F.R.M.S. — “ On an Improved Method of Photographing Histological Pre- 
parations by Sunlight.” By J. J. Woodward, Assistant-Surgeon, U.S. 
Army. — “Haematozoa in Blood of Ceylon Deer.” By Boyd Moss, M.D. 
— “ Microscopical Fissures in the Masticating Surface of Molars and Bicus- 
pids.” By J. H. M‘Quillen, M.D., D.D.S., Professor of Physiology in 
Philadelphia Dental College. — “ Transmutation of Form in certain Protozoa.” 
By Metcalfe Johnson, M.R.C.S.E., Lancaster. — “ On Gnats’ Scales.” By 
Jabez Hogg, Esq., Hon. Sec. R.M.S. — “The Examination of Nobert’s 
