58 Queries. 
343.—To Destroy Beetles.—Can any of your readers inform 
me the best plan of getting rid of the Otorhyncus sulcatus (or 
picipes), which does great damage to raspberry bushes ? 
W. R., Penzance. 
344.—How to Restore Photographs.—Having among my col- 
lection of microscopic objects some badly-mounted micro-photo- 
graphs, I shall be glad to know if they can be remounted without 
injuring the photographs. If this is possible, perhaps some of 
your readers may know and will kindly describe the process by 
which this may be done. W: Eis 
345.—Parasites on Hedgehogs.—Have hedgehogs parasites, 
and, if any, have they ever fleas, and have they any means of 
ridding themselves of them? I have a hedgehog, and a friend of 
mine tells me they have fleas. I have never noticed it, and 
rather doubt the probability of Nature having allowed an animal of 
that peculiar growth to be afflicted in such manner. | 5. B. 
346,—Flies and Pedestrians.—Can any of your contributors 
suggest a remedy against being followed, for miles I may say, by a 
troop of flies, which, taking advantage of the warm summer atmo- 
sphere, attach themselves more particularly to the head of the 
pedestrian, and cause much annoyance by settling upon the face, 
neck, ears, etc. P Wie 
347.—Removing Shells from Brood.—Can any of your readers 
inform me how most birds so effectually remove the shells of their 
eggs when their brood is hatched, and what they do with them ? 
Ave We 
348.—Combustion.—If we imagine a lamp whose wick is of 
considerable length, so that the flame is at a height, say, of a few 
feet above the surface of the oil, the liquid rising by capillary 
force, energy must somewhere be expended in order to lift the oil 
up to this height, and this can only be done at the expense of the 
heat given out by combustion. Therefore, the amount of heat 
given out when, say, a gallon of oil is burnt in such a lamp must 
be less than that given out if the same quantity is burnt in a lamp 
in which the flame is but little above the surface of the oil. The 
difference may be small, but it must exist. Can any reader 
inform me in what respect the phenomena of combustion differ in 
the two cases, in such a way as to account for this difference? I 
should be especially glad of references to writings on the subject. 
G. H. Bryan. 
349.—Lissajou’s Curves.—-Will some correspondent kindly 
inform us of the method pursued in forming these curves upon 
glass, giving at the same time a full description, with dimensions 
of the apparatus needful for producing them upon the usual 
microscopic slips, 3” and 1” ? E: B, 
