1880. ] Recent Literature. 195 
aged. The subscription price of the annual volumes is £1, 10s, 
to the public. 
Leipy’s Ruizopops oF North America.\—This magnificent 
volume, with its wealth of illustration, is the fruits of four years 
of constant study of the fresh-water Rhizopods of this country. 
The author has not only studied them in the Western Territories, 
but also at various points along the Atlantic coast from Nova 
Scotia to Philadelphia. The Rhizopods are the lowest forms of 
life with the exception of the Monera of Haeckel, of which but 
a single species has been detected by Prof. Leidy in this country. 
As a full and thoroughly well illustrated account of these organ- 
ism this volume will prove of service to the general public inter- 
ested in the discussions regarding protoplasm, for here are pic- 
tured with wonderful accuracy and grace these animated bits of 
protoplasm ; to the teacher, who cannot always command even 
a single Amoeba and much less a series of them, here is presented 
on a single plate the Amwba proteus in a dozen different attitudes, 
drawn in colors, in some cases half as large as one’s hand; and 
this plate is succeeded by forty-seven colored chromo-lithographs, 
well engraved, though we doubt not falling far short of the ex- 
quisite original sketches of the author, who is not excelled by any 
living naturalist or zoological artist in the accuracy and artistic 
finish of his drawings. 
_ Moreover the study of these minute changeable protean forms 
is most difficult in itself, and their truthful representation still 
more so, While, then, the volume has a high philosophical and 
educational value, it will stimulate naturalists to cultivate this 
field, and to elucidate the modes of development of these forms. 
o the palzontologist the work will havea high value, since allied 
or possibly the same shelled forms may be discovered in the lake 
formations of the Western Territories. This work forms, conse- 
quently, one of the most important volumes of final reports of the 
great survey now unfortunately closed, and which has done so 
much to spread among our people a knowledge of the natural re- 
Sources of the Western Territories. Biology embraces palzon- 
tology, the latter is more than half of: geology, so that no scien- 
tific geological survey can do its work properly without reference 
to these sciences. The cost to the survey of the field work, t 
Press-work, and, we believe, the illustrations of this volume were — 
but nominal, the printing of the volume with the necessary illus 
trations having been separately ordered by Congress. As the author 
States, “ Whatever may be thought of the pertinence of ublishing 
Such works as the present one with the Reports of the Geological — 
Survey of the Territories, to remove any misapprehension in the 
Matter I deem it proper to state that my contributions have been 
1 Report o 7 3 Territories. Nol. Xu, Fe — 
owe Hagen een sere a katoen a oe gran By JoserH 
Y, M.D. Washington, 1879. 4to, pp. 324, 48 plates. a) 
