May 4, 1905] 



NA TURE 



RADIUM 



We have a limited consig'nment of 



PURE 

 RADIUM BROMIDE 



of the 

 VERY HIGHEST ACTIVITY, 



and are open to supply same in 



5 mg'. tubes at a 



REASONABLE PRICE. 



Manufacturing Chemist, 



10 NEW CAVENDISH STREET, LONDON, W. 



GLEW'S SCINTILLOSCOPE 



(Patent). 

 Shows a magnificent display of scintillations, 

 shciwers of spaiks, direct from the mineral Pitch- 

 blende, Radium, Polonium, Uranium, Thormm, or any 

 radio-active substance, even a Welsbach mantle con- 

 tains sufficient Thormm to excite the very sensitive 

 screen of the Scintilloscope. which is far more sensi- 

 tive than the Spinthariscope. The Scintilloscope 

 rivals the most delicate Electroscope as a detector 

 of Alpha rays. 



The eye sees an inexhaustible shower of stars of 

 white light, giving a very realistic idea of the ceaseless 

 activity of these marvellous substances which are pro- 

 cing the terrific bombardment causing this beautiful display. 



^0r' See Nature, September 29, page 535. 

 ew's Scintill-'scope Superior Lens, with Extra-sensitive Pitchblende and 

 Polonium Screens, giving brilliant efTects, Complete, 75. 6(/. , Post free, 

 U.K. Foreign Postage extra, weight 2 ounces, 

 eces of Pitchblende mineral, ground flat and polished, with Sensitive 

 Screen attached, for use in Scintilloscope or with any strong pocket 

 magnifier, from 7^. 6ii. each, according to size, 

 idio active supplies of every description, on Sale or Hire. Radium 

 Bromide, 1.800,000 units on hire lor lectures. 



HARRISON CLEW, Radiographer (Silver Med.allist, Paris, 1900), 

 156 Clapham Road. London. S.W. 



THE SYTAM SYSTEM 



Saves an incredible amount of wall space and 

 completely utilises dark corners, recesses, and 

 out-of-the-way places. 



Prevents crowding and confusion. 



Allows for extension as and when required. 



Always room for more, hence reorganisation 

 seldom or never necessary. 



Saves time, lightens work, and increases comfort 

 by producing perfect order in the Laboratory, 

 Library, Study, Home, Office, &c. 



The former are very 

 fully selected 



long sections, in order to show 

 the distinctive features and 

 marks of each 

 and also 

 .rked 

 ristics. 

 Bark, Rings 

 Medullary Ray 



Botany and Plant Physiology {hicllidiits 

 0/ above) nozu ready, post free. 



A.. cja.i^ii<e:mka.]mex> & CO., 1^t,A.. 



19 & 21 SUN STREET, Finsbury Square, LONDON, E.G. 



SOME SYTAM FITTINGS. 



1. THE BOTTLE ELEMENT. 



One hundred 4 oz bottles are arranged in one 

 Sytam Bottle - Element occupying less than 

 1 sq. ft. of wall space, each bottle Is Instantly 

 located, removed or replaced, and any size from 

 i-oz. to a Winchester can be accommodated In 

 one and the same element. 



2. THE CLOSED-FRONT BOOK ELEMENT. 



3. THE OPEN-FRONT BOOK ELEMENT. 



4. THE AUTHOR'S FILE. 



For division of subject into headings, chapters 

 or sections, 



5. THE TWIN DESK-TRAYS. 



6. THE PAMPHLET FILE. 



THE SYT^\ivrFTfTMsiGS CO., 



18 & 19 BASINGHALL BUILDINGS. LEEDS. 



R£LX>e C]nexnica.ls, 



R£Li:>e IVIeta^ls, 



I?£i.x>e IVIinier>£ils 



For Laboratory, Scientific, and all other 

 purposes. 



RADIUM SALTS & RADIO-ACTIVE PREPARATIONS. 

 CALCIUM METAL 16oz.; 20/- lb. 



Trice List on Application. 



HARRINGTON BROS., 



Chemical Manufacturers and Dealers, 



4 OLIVER'S YARD, CITY ROAD, 



LONDON. E.C. 



ROWLAND WARD, 



Naturalists and Manufacturers of 



ENTOMOLOGICAL APPARATUS 

 AND CABINETS. 



MAMMAL SKINS. BIRD SKINS. 

 BIRDS' EGGS inclutcheswith full data. 



BOOKS ON ALL NATURAL HISTORY SUBJECTS. 



THE JUNGLE, 166 PICCADILLY. LONDON. 



