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 RADIUM APPLICATORS semployment in Therapeutics and for scientific research. (MacLeod) Surface, each 7s 6i. Throat, £1 1s. BARIUM PLATINOCYANIDE SCREENS, per sq inch, 9d. CALCIUM SULPHiDE, luminous, per lb., 8/- KUNZITE, per Gm., 1/- POLONIUM, ON BISMUTH & COPPER DISCS, each 25/- PITCHBLENDE, specmens, each, per oz., 2,6. URANIUM NITRATE, a?.., 1/-. THOFIUM HYDROXIDE, o2., 4/-; lb, 48/-. PADS, each 10/6. WILLEMITE, Natural Specimens, 2- each. ,, Artificial Specimens, 1/- each. ZINC SULPHIDE, .Active, Gm. 1/6. SCREENS, lo X lo centimetres, each 7/6. Special Quotations for Quantity. CHEMICALS AND APPARATUS for Scientific Research, Write for Price List. SPINTHARISCOPES showing the Scintillations of Radium 21/- W. MARTINDALE, Manufacturing Chemist. 10 NEW CAVENDISH STREET, W. Telegraphic Address: " Martindale, Chemist, London." Telephone : 1797 Paddington RADIUM ON SALE AND LET ON HIRE. Write for Terms. The following can be had by return of post Pitchblende, direct from Joichimsthal, very radio-active, from 1/- to 30/- per piece, Itacolomite, or flexible sandstone, 10/- to 25/- per piece (very rare'. Kunzite, 1/- per gramme. Selected, clear, 2/- Sparteite (see Nature, 31 3/04, fol. 523), 2/- and up cards. Cnlorophane, 2/- and upwards Barium Platino Cyanide in large Crystals in course of manufacture. (Orders Booked). Zinc Sulphide. Phosphorescing a beautiful Green, 2/6 per t' be „ ,,, Yellow, 2/6 ,, Calcium Sulphide ,, „ Violet. 1/- RadiO-active Residue f om which Radium is male; very scarce, 2/- tube. Polonium Sulphide, in tubes o' one gramme, 21/- ,, on Bism ith Rod or Disc 25/- ,, on Copper ,, ,, 25/- Radio-active Screens Willemite), 6d. per sq. nch. Plat. Bar Cyan Screen., 9d. sq inch ,, ,, (Zinc Sulph.), 10 x 10 cm. 7/6. Professional Men, Universities, Schools, &c., allowed special terms. Our newly invented Thorium Inhalers may be had on hire. ARMBRECHTy NELSON & CO., 7t 6c 73y Duke Street, Grosvenor Squaref London, W. Telephone : Gerrard 4942. N.B. — We have to-day received a con-ignment of the New Zealand Vea;etab'e Caterpillar ; it is from 2 to 3 inches long, with a stem showing fructification growing out of its head. Scien- tih'c name of them^ect is Hepialus virescens ; the name of the fungus is Sphneria Kobcrtsiann. Specimens may be had from 10/6 to 21/-, according to quality and size TERMS CASH WITH ORDER. Goods may be returned if not approved of, when money will be refunded.