NOTICE TO SUBSCRIBERS. 



SUBSCRIPTIONS for 1909 HAVE NOW EXPIRED, 



and those for 1910 may be sent to West, Newman & Co., 

 54, Hatton Garden. ALL UNPAID SUBSCRIPTIONS 

 for 1909 should be sent at once. Cases for binding 1909 

 volume can be had, price Is. 2d. post free. Bound volumes 

 price 1 4s. post free. 



Articles and Communications intended for publication, and Books 

 and Pamphlets for review, should be addressed " The Editor of 

 ' The Zoologist,' c/o West, Newman & Co., 54, Hatton Garden, 

 London"; or direct to the Editor, W. L. Distant, Shannon Lodge, 

 Selhurst Road, South Norwood. 



NEW MICROSCOPES 



possess many advantages over the older type, and embody several important features not 



to be found in any others. 



The modified horseshoe base gives greater rigidity, and 

 the larger stage and curved limb additional working space, 

 allowing large size Petri dishes, etc., to be examined with 

 convenience. The new fine adjustment, with an endless 

 motion, is stronger and more durable than the micro- 

 meter screw adjustment, and in the hands of the novice 

 renders breakage of coyer glasses and injury to the 

 front lenses of objectives impossible. It enables the 

 expert worker to attain greater speed in focussing, especi- 

 ally with oil immersion objectives. 



The mechanical features in the new models, combined with 

 the high quality of the recently improved objectives, place 

 the Leitz Microscopes in an 



UNRIVALLED POSITION. 



Prices, with Optical Equipment, from £6 10s. upwards. 



DARK GROUND ILLUMINATION 

 LEITZ' REFLECTING CONDENSER 



is the most satisfactory method to adopt for the observation of Living Unstained 

 Micro-Organisms. It may be attached to the stage or sub-stage of the microscope, and 

 — owing to its unique construction — a strong source of light is not necessary. 

 Price, in Mount, with Centring Screws, £2. 



The instruments and lenses may be examined in the showrooms of reputable dealers, or at the 

 firm's London Branch, where demonstrations of latest inventions are frequently given. 



DESCRIPTIVE CATALOGUE FREE ON REQUEST 



E. LEITZ, 



Telephone : Gerrard 1674. 



OXFORD HOUSE, 

 OXFORD ST., LONDON, W. 



Agents in all University Centres. 



