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ADVERTISEMENT. 
We are happy in having been able to keep time in 
our publication of the present volume, devoted to the 
first portion of the Ruminating Mammalia. It con- 
tains Tliirty-five Plates, which, with few exceptions, 
have been engraved from original drawings made ex- 
pressly for the Naturalist’s Library by Mr Stewart. 
This gentleman, we trust, our readers will think 
has executed his department with great taste, evinc- 
ing also an artist-like knowledge of the anatomy and 
general habits of the animals, and in a pleasing way 
introducing the female and young into the groupes 
where required, to assist in conveying a more perfect 
idea of the species to the reader. This volume forms 
the third of the portion of this work devoted to the 
Natural History of the Mammalia, the first having 
embraced the Monkeys, and the second the Lions, 
Tigers, &c. Volumes on Eagles and Hawks, Parrots, 
British Land and Water Birds, British Quadrupeds, 
British Moths, Sphinxes, &c. are in a state of for- 
wardness, and will shortly make their appearance. 
Our best acknowledgments are due to our nume- 
rous purchasers for their substantial encouragement 
of our work, the demand for the last published vo- 
lume on British Diurnal Lepidoptera (Butterflies) 
having exceeded that of all its predecessors, which 
argues well for the evidently growing taste and desire 
for obtaining information on natural science, to the 
exclusion of less profitable reading. Two years 
ago we certainly did not expect, and we venture to 
remark that no one could have anticipated, a sale 
