230 Answers to Queries. 
several pounds within a few weeks. This is so simple a remedy 
that any person thus afflicted will do well to give it a trial, as it 
cannot possibly do any harm. 
Sting of Queen and. Worker Bees. 
The sting of the Queen Bee is curved larger and slightly 
blunter than that of the Worker, which is quite straight and very 
sharp. The Queen’s sting has three blunt barbs, and is about 
1—2ooth of an inch in diameter ; the worker’s sting has from eight 
to ten sharp barbs, and is about 1—5ooth of an inch in diameter. 
Answers to Queries. 
335.—Double-Pointed Pins— About the most likely place to 
get these in this country is from Eggleston, naturalist, Sunderland. 
If he has not got them in stock, probably he could get them. 
J. A. Hoce. 
340.— Blue Flame produced by Salt.—I have not been able to 
gather any definite information on this subject ; but it appears to 
me that the yellow rays which are given off from the coal are 
absorbed by the sodium vapour through which they have to pass, 
as suggested by Mr. Searle. We know that rays given off by an 
incandescent element are absorbed by being passed through the 
same element in a state of vapour, forming, in the spectrum, absorp- 
tion bands. Probably, this is what occurs here. J. A. Hoce. 
341.—Hoar Frost.—In the powdery form of hoar frost the 
crystals are formed by the direct freezing of aqueous vapour. 
The larger crystals are produced by the freezing of thin layers of 
condensed moisture. J A. Hoe. 
347.--Removing Shells from Brood.—So far as my experience 
goes, birds merely throw the shells over the side of their nests, 
It is nothing unusual to see a number of broken shells under a 
nest of newly-hatched birds. J. A. Hoee. 
356.—Labelling Histo. and Patho. Cabinets.—Probably, the 
most convenient method would be to arrange the slides alpha- 
betically from organs, as heart, liver, lungs, ete. J. A. Hoce: 
377.—Plant-Crystals.—An interesting paper on this subject 
appeared in a recent number of the Botanical Gazette (May, page 
139) :—‘ The author, Dr. Schimper, divides the deposits into two 
classes, one of which is formed during the growing period of 
plants, and the other after the leaves have ceased growing, and 
the formation of the latter class seems to depend on the presence 
