CCXXXVUl 



NA TURE 



[February 24, 1910 



LEITZ' MICROTOMES 



The steady and Increasing demand for good microtomes 

 has induced us to bestow closer attention upon this 

 branch. We have accordingly instituted a separate 

 department for the construction of Microtomes, adapted 

 to the most exacting requirements of the present day. 



J. H. STEWARD'S 



PORTABLE EQUATORIAL 



FOR 



MOUNTING 



TELESCOPES. 



Light but Firm. 

 Easily Manipulated, 



THE LEiTZ MINuT MIURurOME. 



Specially designed for cutting extra thin 



serial sections, and continuous ribbons. 



: carriage moves freely, yet without ihe slightest play. The uni 



versa! clamp-holder is constructed on the principle of Hooke's key. 



PRICE (without knife or ribbon conveyor), £8- 



Many other patterns, from 15s. each. 



Th. 



E. Leitz, 



STAND AND 

 MOUNTING 



£15 15s. 



406 Strand & 457 West Strand, 

 LONDON. 



NEW H:ELI0SC0I>E I>R04JECTI0N CAIVIEJRA 



For the observation of an 



enlarged erect imagre of 



the solar disc. 



ForfitUpartitulars of the above 



Attaches to the Eyepiece, and is com- 

 plete with Rotating Diaphragm with 

 coloured discs. The image is viewed 

 on a glass screen coated with a 

 practically grainless fi^m, er.ablinc 

 the projected image to be vieweit 

 without ttaniposition. Facul^ and 

 the varying brightness of different 

 parts of the photosphere can be 

 easily seen. 



PRICE complete, 30/- ; postage, 8d. 



•d of IVatsoiis Astronomical Tclesiopcs send fot Catalogue 6 N gratis on applieadon. 



(Established) 3,3 HIGH HOLBORN, LONDON, W.C. 



Branch: 16 FORREST ROAD. EDINBURGH. 



W. WATSON & SONS, Ltd. 



Works: BARNET, HERTS. 

 Depots-2 EASY ROW. BIRMINGHAM: 78 SWANSTON STREET. MELBOURNE. AUSTRALIA. 



A NEW DALLMEYER STIGMATIC. 



The Carfac Series IV f/6.3 is a lo^w priced rapid anastigmat giving good definition at full 

 aperture. Particularly suitable for hand cameras of all types. 



By a great simplification in design the manufacturing cost has been reduced, with the result that this lens is remark- 

 ably low in price. Moreover, though containing only four glasses, the front combination may be used alone and 

 gives pictures nearly three times the ordinary size, whilst the back alone with short extension gives pictures nearly 



■ —~ ■ half as targe again as the complete lens. — 



WHY NOT SEE IT AT OUR SHOWROOMS AT 25 NEWMAN STREET, OXFORD STREET? 



BRITISH MADE. Throe Lghscs in One. ^^^^^''^^ '^-^de. 



PRICES: i-plate, «3 5 4 and Postcard, £3 10 O 

 A-plate, £4 5 O 7 x 5, £5 15 O 



Vatnlogiie fr<r from 



J. H. DALLMEYER, Ltd., 



Showrooms: 23 NEWMAN STREET, W. 



lOHDDM 



LGNDDri 



Printed by Richard Clav & Sons, Limited, at 7 & 8 Bread Street Hill, Q 

 AND Co., Limited, at St. Martins Street, London, W.C, and Th; "' 



Macmillah 

 31 ^ 



/ictoria Street, in the City of Lonaon, and published by MacmillaM 1 

 CpMPANV, 66 Fifth .\venue, New York.— Thursday, Feb. 24, 191a. ; 



