TO OUR SUBSCRIBERS. 
ry 
of the **Monograph,” though with slight modifica- 
tions, necessitated by the inordinate increases in the cost of 
labour and material. Although the increase of cost to Sub- 
scribers is far from being adequate to meet the enhanced 
expenses in which we are involved by its publication, it is. 
hoped that these inflated costs will be more or less quickly 
reduced to such a level as to relieve us from the strain of — 
this unsatisfactory position, and expedite the completion. of 
the work. 
It has also been decided not to break the continuity of 
Maps illustrating the geographical range of the different 
species, not only for the sake of consistency throughout the 
work, but also because the new boundaries between the 
various nations, set up by the Allies, will probably eventually 
prove to be more or less tentative: 
SCIENTIFIC WORKS 
PUBLISHED BY TAYLOR BROS., SOVEREIGN ST., LEEDS. 
ILLUSTRATED INDEX OF 
BRITISH FRESHWATER SHELLS, 
By ARTHUR G. STUBBS. 
Containing life-like and authentic figures of all the British species of Freshwater Shells 
with descriptions of the chief characteristics, colouring, habitat, and relative scarcity or 
abundance of each species, and an enumeration and description of their varieties. 
PRICE 3/9 POST-FREE. 
WILD-BIRD PROTECTION AND NESTING BOXES. — 
By J. R. B. MASEFIELD, M.A., 
VicE-PRESIDENT NortrH Srarrs. NAt. Fietp CLus. 
Illustrated with NINE COLLOTYPE PLATES and many Engrayings in the text, showing various ~ 
designs of Bird Brackets, etc., that have actually been used by Wild Birds for Nidification, and a full list © 
of the Orders made under the ‘‘ Wild Birds’ Protection Acts,” on the application of County Councils, with ~~ 
the names of the species protected. 
PRICE FIVE SHILLINGS. 
ITH the issue of Part 24 we resume the publication 3 
Ta 
