NA TURE 



[August 3, 1905 



THE CAIFFE AUTO-MOTOR 

 MERCURY JET INTERRUPTER 



(Patented in Britain). 



NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR. 



The interruption cuts the current both for motor and coil. 

 In other words, motor and interrupter are electrically and 

 mechanically linked together. 



1*" See Nature. July 20, 1905, page 377. 



Price, including box and packing, £4 : 6 : 6 



THE MEDICAL SUPPLY 

 ASSOCIATION, 



OX^,OSSX^E2"Sr'S i3rA.^ ESl^O^-II^XS^ 



RECENTLY 

 REMODELLED. 



Represents K and L 



types, g-iving- 3-5 H.P. 



and 5 H.P 



respectively. 



Immediate Delivery 



for Stock Sizes 



of Engines. 



GREAT REDUCTION 

 GAS CONSUMED. 



Up to the end of 1904. 

 over 51,000 gas and 

 oil engfines iiad been 



delivered, represent- 

 ing- about tliree- 

 quarters of a million 



actual horse-power. 



CROSSLE"!^ :BItOfc»., 31.Tr>., OF»EIVrSIl^^A7V, 3Vi:A.I>JCIIESTEia 



:^^:ei^w 3VCI0£^,0S00F»I0 



From the New Is 



of W. WATSON & SONS' No. 3 CATALOGUE, just published. Post Free 



applii 



Tsetse Flies (G. palpalis), whole insect 



Dissections of all parts may be had mounted separately. Also in 



set of 12 ; 



Send for Special Descriptive List. 



Blood-sucking Maggot (from the Congo) 



Fly hatched from above, ^ ;/tr/:;«t'?v/«_j'/(i /«/(T<7/(i ... 



Section of Brazilian Quartz, showing cavities containing fluid- 

 Very interesting 



Eggs of Emperor Moth, fertile and sterile, on i slide 



Perfume Glands on Leaf of Lavender 



Bugula plumosa (Bird's Head coralline). Specially fine mounts 



Karyokinesis in root of Water Lily 3 



Leg of Flea, showing muscular structure 



Set of 16 Slides illustrating the development of an Ascidian 



(Aspersa). Incase 



Trypanosoma Brucei (Tsetse Fly disease) 



Set of 5 Slides of the Garden Spider, showing different stages of 



growth. In C.ise 



SEND FOR THE ABOVE NEWLY PUBLISHED CATALOGUE OF MICRO. OBJECTS. 



WATSON'S CATALOGUE OF MICROSCOPES (158 pages) is of special interest to all Microscopists, 



post free. 



W. WATSON & SONS, 313 High Holborn, London, W.C. 



Branches-16 FORREST ROAD. EDINBURGH and 2 EASY ROW. BIRMINGHAM. 



THE CORRESPONDENTS' CAMERA. 



FOR HAND 

 OR TRIPOD 



lade for the 



jse of Newspaper Men in South Africa, and since used all over the World. 



T^niS Camera has been designed for the use of correspondents, 

 artists, and other travellers who, while requiring a Camera 

 possessing the greatest stability, cannot spare the space for a regular 

 field camera in addition to a hand camera. It is made of the best 

 mahogany, carefully finished and covered with hard morocco 

 leather, or polished in natural colour or ebonised at the same price. 

 It is admirably adapted for Telephoto work. Owing to 

 the use of wood instead of metal, wherever possible, this 

 camera is lig^hter than many of less substantial make. 

 EACH SIZE PERMITS OF THE USE OF THE SINGLE COMPONENTS OF A STIGMATIC OR OTHER CONVERTIBLE LENS. 

 PRICE, inckiding 3 Double SMdes, but ( 4i by 3J. 5 by 4. 61 by 4;. 



without Lens or Shutter. 1 £5 X5s. 



6cl. 



£6 IDs. Od. 



£7 15s. Od. 



J. M. DALLIMEYER, Ltd., 25 NEWMAN ST., OXFORD ST., LONDON, W. 



MAKERS OF THE CELEBRATED DSLLMEYER LENSES. 



