

NOTES AND QUERIES. 259 
component parts might in some instances be correctly given, the 
tout ensemble would be scarcely recognised. Dr. Goring, 1845. 
MICROSCOPICAL CEMENT.—A few of our readers would perhaps 
be glad to know of a cheap cement for mending cells, and for 
preventing running in of the finishing varnish. Let them procure 
some ‘patent knotting” from the oil and colour stores, and expose 
it a little while to the air, until it has become of the proper con- 
sistency. It makes an admirable cement.—A. R. D. 
THE VERTICAL PosiTIoN oF Microscopes.—I do not like this 
position at all. It should, I think, be only used with bodies which 
must be confined to the stage by their gravity alone, which case 
may sometimes occur; but I have made most ample provision for 
presenting all sorts of objects in any position without regard to 
their gravitation, by means of the aquatic wet and dry boxes and 
the slide holder, &c. I think that the practice of poring down- 
wards (the ordinary way of observation with microscopists of the 
old school) is peculiarly detrimental to the head and eyes, having 
a great tendency to determine the blood to them. We never hear 
of astronomers, who are perpetually looking upwards, having their 
sight injured, like observers with microscopes, though they have 
to look, if possible, still more steadfastly and intently than the 
latter, with the highest powers.—Dyr. Goring, in Pritchard’s Mficro- 
scopic Illustrations. 

