Weather forecasting a certainty 



WITH DAVIDSON'S 



OLD DUTCH WEATHER GLASS 



More sensitive than the 

 most perfect barometer. 



The water will rise in the spout as bad 

 weather becomes likely, falling- for fine 

 weather. 



Price 1216 ; or post free hi 

 U.K., 1416, abroad, 1716. 



" Nothing disturbed its accuracy, and 

 its possession saved me many other- 

 wise anxious hours at sea." — Capt. 

 Kessler in Nautical Magazine. 



F. DAVIDSON &C CO.. 



29, GT. PORTLAND STREET, LONDON, W.l. 



WATKINS & DONCASTER 



36, STRAND, LONDON, W.O. 



(Five Doors from Charing Cross), 



Keep In stock every description of 



APPARATUS, CABINETS, BOOKS, AND SPECIMENS 



for Collectors of 



BIRDS' EGGS, BUTTERFLIES, MOTHS, ETC. 



Catalogue (96 pages) sent post free on application. 



LEPIDOPTERA LIST OF LOTS NO. X. 



Just published. Very moderate prices quoted in 

 shillings. Contains : — 50 Palaearctic Lepidoptcra 

 Lots ; 62 Exotic Lepidoptera Lots. Special offer in 

 rarities, books, used cabinets, utensils. Complete 

 collections of Lepidoptera, Coleoptcra, and other 

 Insects. Lists gratis on demand. 



Dr. O. Staudinger & A. Bang-Haas, 



Dresden-Blasewitz. 



Printed at Browns' Savilf, Press, 40 George Street, Hull, and published by 

 A. Brown & Sons, Limited, at 5 Farringdon Avenue, in the City of London. 



May ist, 1921. 



