Ixxx 



NA TURE 



[JUNE 2 2, 1905 



GAIFFE-D ARSONVAL MACHINE 



Replaces Coils, Interrupters, and Wimshurst 

 Machines. 



Producing, perfectly regulating, and exactly measuringr 



X-RAYS, HIGH-FREQUENCY CURRENTS, AND 

 STATIC EFFECTS. 



Tilis apparatus has been already installed by in.my ..f the chief workers in Electro-Therapeutics 

 in France and England, and ii civine the very best results (tUIc testimonials), 



:^^^ Replaces large lr|ductlon Coils Ir) Laboratory at)d Research Work requiring 

 "^^^ High Electric Tensions or Electric Oscillations of great power ai)d uniformity. 



Descriptive Pamphlet gratis on application from the Sole Agents for Great Britain 



THE MEDICAL SUPPLY ASSOCIATION, 



228 Cray's Inn Road, London, W.C, ^,^,y'ge "-i^.r^^^l 



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



Tsetse Flies (G. palpalis), whole insect 



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



set of r2 ; 



Send for Special Descriptive List. 



Blood-sucking Maggot (from the Congo) ... .. 



Fly hatched from above, ..4 «£:/i;«e?WH_v/(r /«/C(j/fZ ... 



Section of Brazilian Quartz, showing cavities containing fluid. 



Very interesting 

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



7 6 



Perfume Glands on Leaf of La 

 Bugula plumosa (Bird's Herd 

 Karyoki_nes;s in root of Water Lily 



nine). Specially fin 



Leg of Flea; sho 



Set of 16 Slides illustrating the d 



(Aspersa)- In case ... 

 Tiypanosoma Brucei (Tsetse Fly dis 

 Set of s Slides of the Garden Spide; 



growth. In Case ■ 



showing different stages of 



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



IV/irSO/V'S CATALOGUE OF MICROSCOPES {15S pa^es) is of special interest to all Microscopists, 



post free. 

 W. WATSON & SONS, 313 Hig^h Hoiborn, London, W.C. 



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



CJT<.€>S^X^H'^r'& i3i-J^^ £:^C3-I»JX3» 



GREAT REDUCTION 

 GAS CONSUMED. 



Up to the end of 1904, 

 over 51,000 gas and 

 oil eng"ines have been 



delivered, represent- 

 ing about three- 

 quarters of a million 



actual horse-power. 



RECENTLY 

 REMODELLED. 



Represents K and L 



types, giving- 3 "5 H.P. 



and 5 H.P 



respectively. 



Immediate Delivery 



for Stock Sizes 



of Engines. 



CR.OSSLE'V BR,OS., X.Tr>., OF'EIKJSIIA.'VV. JVI A. JJCHESTEI^. 



DALLMEYER'S 



PRISMATIC Jl 



BINOCULARS. 



"THE SERVICE." 



Will not get out of Adjustment. Easy to Clean. 

 Easy to Handle. Lightest Glass Made. 



Powers 4, 6, S, lo. 12. 

 B«- lllnstr.itci Paiul<ldet Post Fu-c. 



J. H. DALLMEYER, LTD., 



25 NEWMAN ST., LONDON, W. 



Makers of the Celebrated Dallmeyer Lenses. 



, Limited, at 7 & li Lread Street Hill, Queen Victoria Street, in the City of London, and published by Macmillan 

 5 Street, London, W.C, and The Macmillan Company, 66 Fifth Avenue, New York.— Thursday, June 22, 1905. 



