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communications for the Editor should be addressed to No. 192, Piccadilly, W. To avoid disappointment contributions should be received on or before the 15th of each month. No notice can be taken of anonymous communications. All notes, queries, or articles for insertion must be guaranteed by the name and address of the writer, which may be withheld from publication if so desired.

—Having been inundated with questions, we are compelled to announce that we cannot undertake to answer those of which the querist might satisfy himself by an appeal to any elementary book on the subject. We are always prepared to accept queries of a critical nature, and to publish the replies, provided some of our readers, beside the querist, are likely to take an interest in them.

—For information respecting this must apply to the inventors, Messrs. Glover and Sons, Ranelagh-road, Pimlico, S.W.

—We are not aware that any of the lectures you name have been published.

—Having obtained other specimens, and distributed them, we hope that now every one who was previously disappointed has been supplied.

—We fear that, practically, we could not carry out your suggestion in a periodical.

(Amlwch).—Procure the "Manual of Structural Botany," Hardwicke, 1s. 6d.; and Oliver and Henslow's "Botany," about 5s.

—It is a dung beetle (Geotrupes puncticollis, Steph.). This will suggest the reason for your being unsuccessful.

—It is quite a matter of taste. Look at the insects in the British Museum.

—Keep camphor, or some turpentine on a sponge, with your skins.

—Westwood's "Introduction to Entomology," 2 vols., about 14s., and Stephen's "Manual of Beetles," 7s.; second-hand, at Mr. Wheldon's, 58, Great Queen-street, London.

—Is referred to page 24, whence he will learn that lists and tables are inadmissible.

—The excrescences are produced by a dipterous insect; no one would venture to say what species without seeing it.

—(1.) Some emerge, others become victims, the majority hybernate. (2.) Look for the two crowns. (3.) Yes. (4.) Doubtless, the snails.

—Queries which, with their replies, are only likely to interest the querist, can only be answered briefly here.

—Asphalte is the best cement for ordinary cells, and is easily manipulated with the aid of Shadbolt's whirling table. The thin glass cover is easily secured with the same cement.—

—Consult Dr. Hassall's "Food and its Adulterations."—The brown scale frequently seen on the rinds of oranges is the shield of a coccus or scale insect. An interesting paper, with illustrations, on this subject, by Mr. Richard Beck, will be found in the Transactions of the Microscopic Society of London, vol. ix., new series, page 47.—

(Glasgow).—Forward your address, and the names of your mosses shall be sent. We cannot afford space for so long a series.

—The cost of a camera lucida is from one to two guineas; a very good substitute may be had of some opticians for five shillings; of a Coddington lens from five shillings.

—Fossils and minerals may be purchased at any of the following shops in London; we can say nothing of the relative prices:—Tennant, 149, Strand; Calvert, 189, Strand; Wright, 36, Great Russell-street.

—A very common trick with some birds.

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—————Ross.——— (In the present No.)——————————Sportsman (must be guaranteed by the name and address of the writer).——— (certainly not).——— (Bristol).— (yes, if suitable).——————A Wykehamist (no name).—————————and (we are not artists).————————— (Bognor).———————— (rather common).— (we know of none).—D.—— (Rugby).————Old Stones.——————————Leonara.———E. Jones.———Peter.————————————————————————B.——————————— (Amlwch).——————A Subscriber.——————————

—"On our Knowledge of the Causes of the Phenomena of Organic Nature, being six lectures by Professor Huxley. London: Hardwicke.—"Oswestry and Welshpool Naturalists' Field Club Report for 1857-1864." Oswestry: A. Roberts.—"Gleanings amongst the Irish Cryptograms," by B. Carrington, M.D., F.L.S.—"The Anatomy and Physiology of the Perforating Apparatus of Pholas Dactylus," by John Robertson. Brighton: W. Pearce.—"Observations on the Classification of the Genus Rosa," by Deseglise, reprinted from the Naturalist. Huddersfield: Weatley & Co.—"The Stream of Life on our Globe," by  Milton, M.R.C.S. London: Hardwicke.