203 



382. URANOSO-URANIC OXIDE. U S 8 . 



a. Blackish powder. 



Note. This oxide is the chief constituent of pitchblende. For a speci- 

 men of it, see Case No. 8. 



383. SODIUM URANATE. Na, 0, 2 U { . 



a. Yellowish powder. (Uranium yellow.') 



TUNGSTEN, OR WOLFRAM. W. 



384. OXIDE. W0 3 . (Tungstic Acid.) 



a. Impure, a yellow powder. 



b. Pure ditto. 



c. Hydrated, a white powder. (W 3 , 2 H 2 0.) 



Note. Specimen c was precipitated from a cold dilute alkaline 

 solution. 



MOLYBDENUM. Mo. 



385. METALLIC. 



t Small pellets. 



386. OXIDE. Mo0 3 . (Molybdic Acid.) 



a. Impure. 



b. Pure, in white powder. 



387. SULPHIDE. Mo S 2 . (Molybdenite, Native Sulphide of Molybdenum.) 



a. Black scale-like lamimu with a metallic lustre. 

 Note. For native mo'ybdate of lead, see Lead salts. 



388. Series of Specimens illustrating STANFORD'S Process for Manu- 

 facturing Seaweed Products. 



(1) LAMINARIA DIGITATA, Lamour. (Oar Weed, Tangle, Sea Girdles.) 



a. Cylindrical portion of frond. (Drift Weed, or Tangle.) 



b. Ditto, cut up ready for charring. 



c. Charcoal made from b. 



d. Ditto, lixiviated. 



e. Flattened portion of frond. (Cut Weed, Red Wrack.) 



f. Charcoal made from e. 



g. Ditto, lixiviated. 



(J) Frcus VESICULOSUS, L. (Cut Weed, Bladder Wrack.) 



a. Frond. 



b. Charcoal made from a. 



c. Ditto lixiviated. 



(3) Focus SERRATUS, L. (Cut Weed, Black Wrack.) 



a. Frond. 



b. Charcoal made from a. 



c. Ditto, lixiviated. 



