ENTOMOLOGY.— Life-Histories of British Lepidoptera, 

 very interesting, low rates, selections on approval. Cheap 

 Type Collections of British and Tropical Lepidoptera, Coleoptcra, 

 also Aculeate Hymenoptera, Hemiptera, &c. Lists free. A few 

 British P. Dispar (large Coppers). 



A. FORD, 36, Irving Road, Bournemouth. 



WATKINS & DONCASTER, 



Manufacturers of Cabinets and Apparatus for 

 Collectors of Birds' Eggs, Insects, Plants, &c. 



A large stock of Insects, Birds' Eggs, &c. List of Clutches of Birds' 

 Eggs on application. Climbing Irons, host steel, with straps complete, 

 5s. per pair. Egg Collector's Outfit, containing Drills, Blow pipes, and all 

 Requisites complete, with Hook of Instructions, post free, 3s. 3d. Label 

 Lists of every description. Birds and Animals stuffed and mounted in 

 Natural Positions. For particulars see our Catalogue, one hundred pages. 



36, STRAND, LONDON, W.C. 



LEITZ' NEW MICROSCOPES 



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

 to be found in any others. 



The modified horse-shoe 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 

 BY LEITZ' REFLECTING CONDENSER 



is the only satisfactory method to adopt for the investigation of the Minutest Living 

 Bacteria, fresh unstained blood films for Trypanosomiasis, (tc, etc. 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, 01 al the 

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



DESCRIPTIVE CATALOGUE FREE ON REQUEST. 



OXFORD HOUSE, 

 9, OXFORD ST., LONDON, W. 



Telephone: (ierrard L674. 



E. LEITZ, 



