MANTELL ON THE MICROSCOPE. 
Now ready, with 12 Colored Plates and several Wood cuts, Crown 8vo. 
THOUGHTS on ANIMALCULES; or a Glimpse _ the 
Invisible World, revealed by the Microscope By Gripron A. 
Mantett, LL. D., F.R.S., Author of i Medals of Cididon, a 
©The Wonders of Geology.” 
“The object of this volume is to present a familiar exposition 
of the nature and habits of some of those invisible beings which 
people our lakes and streams, in the hope that by placing them 
in a striking point of view, and describing them as much as pos- 
sible in janiguiage divested of scientific terms, the subject may be 
made attractive and interesting to the general reader.’’—Author’s 
Preface. 
JOHN MURRAY, Albemarle Street, London. 
BOSTON JOURNAL OF NATURAL HISTORY, 
FIVE VOLUMES, 8v0.—PLATES. 
Tuts work continues to be published by the Boston Society 
of Natural History, in numbers of about 125 pages each, of 
which four make a volume. It contains numerous papers on the 
natural history of the United States, and a knowledge of its con- 
tents is indispensable to those who would understand the pro- 
_ gress of Zoology in North America during the last ten years. 
Price 5 dollars a volume. 
It may be obtained by addressing the Saviaty ‘airectlys or by 
order through Winey & Putnam, No. 6, Waterloo Place, London, 
and from the principal Booksellers in New York, Boston, and 
Philadelphia. 
* 
Ellis’s Medical A it BE Reber aie —The Publishers of this Work rempect- 
vious editions of the 
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Fiat ee Gea, night 28 Ge icuing. 
