152 THE ENTOMOLOGIST. 
to the antenne. I do not agree with Mr. Doubleday’s 
opinion about camphor causing grease in insects. To speak 
more correctly, I should say that insects wll grease, quite 
irrespective of camphor, which very probably may cause 
its more speedy appearance. Once more to quote Mr, 
Newman; to nothing is the aphorism—“ Prevention,” &c.— 
more applicable than to grease. I am sorry Mr. Clark finds 
my method of “prevention” so difficult. I am quzte sure 
that the difficulties may be overcome by anyone gifted with 
an ordinary deftness of fingers. Let me urge him to try, and 
try again. Begin on some of the common, stout-bodied 
moths, having first carefully studied the directions. The 
method, doubtless, requires some little skill, and much 
patience; but he will be amply rewarded by seeing his 
insects, after the lapse of years, as fresh and neat as the day 
they were set. Lastly,—I have used camphor for twenty-five 
years, and find it quite guiltless of the many sins laid to its 
charge. I have always thought it, and still think it, the best 
preservative. Mr. Brown’s objection—“ As camphor must 
evaporate, little particles must settle on the wings of the 
specimens”—is new to me. Will not the particles themselves 
evaporate ?—[Rer.] J. Greene; Clifton, Bristol. 
Relaxing Butterflie.—In No. 156 of your valued 
‘Entomologist’ (Entom. ix. 137) one of your correspondents 
wishes to know a good method of relaxing butterflies. 
Through the kindness of a Lepidopterist, Mr. Pickel, of 
Landsberg, I am able to give you a description of an 
apparatus for this purpose, communicated to me for my 
‘Entomological News.’ The apparatus consists of an oval 
zinc-box, seven inches long by four inches wide, and two 
inches and a half deep, and is closed with a lid, which has an 
edge of half an inch to draw over it; in one of the sides of 
the box there is a hole half an inch from the upper edge, 
through which a zinc tube, quarter of an inch in breadth, is 
passed slantingly from the inner to the outer side, and is 
soldered in such a manner that the upper half of the tube 
reaches about half an inch on the inside of the box, but does 
not touch the lid, whilst the lower end terminates in a down- 
ward direction, about an inch and a half on the outside. In 
order to be able to place the pinned butterflies in the box 
there are cork strips on the bottom, which are held by thin 
