NA TURE 



[July 20, 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. 



Price, including box and packing, 

 £4 : 6 : 6 in Britain. 



THE MEDICAL SUPPLY 

 ASSOCIATION, 



228 Gi:*a.y'*s Ixixi ECoELd, ILioi:«^clon., 'W.C 



Jhsffiptirc Circular itjtfm oj}plicafioti. 



From the New issue of W. WATSON & SONS' No. 3 CATALOGUE, just published. Post Free on application. 



; Flies (G. palpalis), whole insect 



:tions of all parts may be had mounted separately. Also ir 



Send for Special Descriptive List. 



Blood-sucking Maggot (from the ConRo) 



Fly hatched trom above, Aiichiiieromyut luteola 



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 1 fr 



Bugula plumosa (Bird's Head coralline). Specially fine muunts 2 6- 



Karyokinesis in root of Water Lily 3/- & 4/- 



Leg of Flea, showing muscular structure ... ... ... ... 1 6 



Set of 16 Slides illustrating the development of an Ascidian 



(Aspersa). Incase 25 O 



Trypanosoma Brucei (Tsetse Fly disease) 4 O 



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



■ ' " 7 fr ' 



growth, in C 



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 Hoiborn, London, W.C. 



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



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 REDUCTIOH 

 GAS CONSUMED. 



Up to the end of 1904, 

 over 51,000 g-as and 

 oil eng-ines had been 



delivered, represent- 

 ing" about three- 

 quarters of a million 



actual horse-power. 



CR-OSSLE'V :Bie,OS., X.TP., OFEJJSBCA.'W, Ita:A.3VCIIESTER. 



DALLMEYER'S NEW TELEPHOTO LENS. 



Can be used in front of any 

 small lens without disturbing 

 plates or films which may be 

 in position. 



Can be used alone for higher 

 magnification or larger plates. 



An excellent lens for all 

 artistic jjhotography. 



THE ADON 



(REGISTERED) 



Mounted in Aluminium. 



Measures 3^ ins. long, ijins. 

 diameter, weighs 4f ounces. 



PRICE, including Solid Leather 

 Case, £3 10 O "Stt. 



Illustrated Booklet with 



Specimens of Work 



FREE. 



PATENT. 



J. H. T'fc A T -T - TVTT^^y "EilZ., LTD., 25 Newman St., London, W, 



MAKERS OF THE CELEBRATED DALLMEYER LENSES. 



, London, W.C, md The Ma 



Hill. Queen Vi 



, : City of London, .ind publhhed by Ma 



V, 66 Fifth Avenue, New York.— Thursday, July 20, 



