ON SALE AND LET ON HIRE.—Write for Terms.
=The following can be had by return of post.=
=Pitchblende=, direct from Joachimsthal, 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 upwards.
=Chlorophane, 2/-= and upwards. =Barium Platino Cyanide in large Crystals= in course of manufacture. (ORDERS BOOKED).
=Zinc Sulphide.= Phosphorescing a beautiful Green, =2/6= per tube.
=Zinc Sulphide.= Phosphorescing a beautiful Yellow, =2/6= per tube.
=Calcium Sulphide= Phosphorescing a beautiful Violet, =1/-= per tube.
=Radio-active Residue= from which Radium is made; very scarce, =2/-= tube.
=Polonium Sulphide=, in tubes of one gramme, =21/-=
=Polonium= on Bismuth Rod or Disc, =25/-=
=Polonium= on Copper Rod or Disc, =25/-=
=Radio-active Screens= (Willemite), =6d.= per sq. inch. Plat. Bar. Cyan Screen., =9d.= sq. inch
=Radio-active Screens= (Zinc Sulph.), 10 × 10 cm. =7/6.=
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_Professional Men, Universities, Schools, &c., allowed special terms._
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=Our newly invented Thorium Inhalers may be had on hire.=
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ARMBRECHT, NELSON & CO., _71 & 73, Duke Street, Grosvenor Square, London, W._ Telephone: GERRARD 4942.
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N.B.—We have to-day received a consignment of the New Zealand Vegetable Caterpillar; it is from 2 to 3 inches long, with a stem showing fructification growing out of its head. Scientific name of the insect is _Hepialus virescens_; the name of the fungus is _Sphaeria Robertsiana_. Specimens may be had from =10/6= to =21/-=, according to quality and size.
