LEITZ 



MICRO-OBJECTIVES. 





ACHROMATIC. 



1| in. focal length 

 1 in. ,, „ 

 § in- n 

 Jin. „ „ 

 1 in. „ „ 

 i in. ,, ,, 



£ s. d. 

 0-11 N.A. 15 

 0-21 N.A. 15 

 0-30 N.A. 15 

 0-40 N.A. 10 

 0-47 N.A. 15 

 0-77N.A. 15 



£ s. d. 

 ^ in. focal length 0-82 N.A. 1 10 

 ^in. „ „ -G-SoN.A. 1 10 

 -j^^ in. „ ,, water 1-20 N.A. 3 10 

 -rVin. „ ,, oil 1-30 N.A. 3 15 

 j', in. „ „ oil 1-30 N.A. 5 





FLUORITE. 1 



^ in. focal length 

 1 in. ,, 

 T'uin. „ „ 



£ s. d. 

 0-82 N.A. 2 

 0-85 N.A. 2 

 0-87 N.A. 2 



£ s. d. 

 1=2 in. focal length 0-87 N.A. 3 10 

 Jjin. „ ,, oil 1-32 N.A. 6 10 

 J^in. „ ,, oil 1-32 N.A. 7 10 





APOCHROMATIC. | 



16 mm. focal length 

 8 mm. ,, ,, 

 4 mm. „ „ 



£ s. d. 

 O-SON.A. 3 

 0-65 N.A. 4 

 0-95 N.A. 6 



£ s. d. 1 

 3 mm. focal length 0-95 N.A. 6 10 | 

 2 mm. ,, „ oil 1-32 N.A. 12 10 1 

 2 mm. „ „ oil 1-40 N.A. 16 5 1 



Any of tin 



E. Leitz 



above made for long tube length without extra cost. 



J Oxford House, 9, Oxford Street, London, W. 



Foolscap 8vo, Cloth, gilt top, 160^^. + blanhs for Notes. Price 2s. 6d, 



POCKET BOOK otBRlTISH BIRD5 



By E. F. M. ELMS. 



INFOEMATION is given respecting all British birds that breed in 

 these islands, and those that are regular visitors at one time of 

 the year or another, with remarks as to a species being resident, inter- 

 migratory, or migratory. Each species is separately treated under 

 the headings: Haunts, including distribution; Plumage, briefly charac- 

 terizing the predominant and striking features, with differentiation 

 of species nearly alike ; Language, with song and various cries ; 

 Habits ; Food : Nidification, with site and materials of nest ; and 

 number and description of Eggs. 



The AVICULTURAL MAGAZINE 



Edited by J. LEWIS BONHOTE, M.A. 



To promote the study of Birds, both British and Foreign, in 



freedom and in captivity. Frequent Illustrations. 



ANNUAL SUBSCRIPTION, 15s. POST FREE. 



London: WEST, NEWMAN dc CO., 54, Hatton Garden, E.C. 



