NA TURE 



[August 31, 1905 



1 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 

 mfchanically linked together. 



0*~ See N.\TURE, July 2o, 1905, page 277. 



Price, including box and packing, £4 



6 



THE MEDICAL SUPPLY 

 ASSOCIATION, 



OX^OSSX^XS^ST'S 0-.A.S JSI^CIKIl^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 Ensines. 



GREAT REDUCTION 

 GAS CONSUMED. 



Up to theend of 1904, 

 over 51,000 g-as and 

 oil engfines had been 



delivered, represent- 

 ing- about three- 

 quarters of a million 



actual horse-power. 



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



; (G. palpalis), whole insect 



of all parts may be hid mounted separately. Also in 



set ol 12 ; 



Send for Special Descriptive List. 



Elood-sucking Maggot (from the Congo) , 



Fly hatched from above, A?ich}>icromyia luieola 



Section of Brazilian CJuartz, showing cavities containing fluid. 

 Very interesting ... ... ... ... ... 



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



Perfume Glands on Leaf of La vend 

 Bugula plumosa (Bird's Head cor; 

 Karyolcinesis tn root of Water Lily 

 Leg of Flea, showing musci " 

 Set of 16 Slides illu-itrating the 



(Aspersa). In case 



Trypanosoma Brucei (Tsetse Fly di 

 Set of 5 Slides of the Garden Spid' 



srjwtb. In Case 



line). Specially fine mounts 

 3 



ivelopment of an Asridian 



lase) _." ;;: ;;; ;;; 



, showing (lifferent stages of 



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



If/irSO/V'S CATALOGUE OF MICROSCOPES (153 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. 



OALLMEYER'S TELE-PHOTO. LEKSES & ATTACHMENTS 



Enable you to take Photographs of Distant or Inaccessible 

 Subjects of sufficient size to be of practical value. 



a«- Indispensable for use in all departments of Natural 

 History Field Work (especially Ornithology), and also 

 to Architects. 



Price from £3 15s. 



r'n'res am/ Particulars on application. Estimates an i 

 advice free. 



_ J. H. DALLIVIEYER, Ltd., 



stigmatie Lens fitted with Tele-Photo. Attachment. ^5 Newman Street, London, W., 



(These Attachments can be fitted to any good Lens.) THE CELEBRATED DALLMEYER LENSES. 



lied by Richard Ci.av anu Sons, Limiteh, at 7 & S Hread Street Hill. Queen Vic 

 »ND Co., Limited, at St. Mavlin's Street, London, W.C, and The M acmillan Com h 



I Sti 



■eet, in the City of London, and published by Macmii.la 

 Fifth Avenue, New Yorlc.— Thursday, August 31, 1905. 



