Bibliography. 149 
finished. Such figures worked into the page, quite supersede the ne-. 
cessity of more costly and less convenient copper plates. 
~The introduction to the present volume must be read with delight i 
all who feel any interest in the past history of our globe, as drawn from 
organic evidences. We shall take pleasure, as far as it may be prac- 
ticable, in making from this chapter and other parts of this * History,’ 
such extracts and abstracts as will be most likely to interest our 
readers. 
- 8. Thoughts on Animalcules, or a Glimpse of the Invisible World 
revealed by the Microscope; by GipEon ALGERNON a Esq., 
LL. D., FLR. S., &e. 1846. 
Notes of o Miciiehbin Examination of Chalk and Flint; by the 
same Author. 1845. . 
The wonders revealed by the microscope are becoming every day 
more interesting and instructive. At the head of the works on this 
subject, stands Ehrenberg’s magnificent folio, illustrated by sixty-four 
colored plates. 
_ “The reader who has not seen this work, can have no ) adequate idea 
of the fantastic shapes, and the almost endless variety of form and 
structure which animal existence assumes, even in our own planet, in 
the regions from which the microscope withdraws the veil.” 
The Thoughts on Animalcules of Dr. Mantell are contained in a 
beautiful little volume of 144 pages, containing twelve exquisitely 
figured and colored plates of living animalcules, drawn from nature 
and greatly magnified. This work is in keeping with all others of the 
same distinguished author, not only in eloquence of thought and dic- 
tion, and in minuteness and accuracy of research, but in the minor ex- 
eniiees - paper, print, and binding. 
prepared in London and Paris at prices 
within the reach of inciet literary and scientific institutions, and of many 
individuals, by which the wonders he describes may be easily demon- 
strated from specimens found in almost every ~_ and pool of water. 
The principal divisions of the work are— 
1. The ideal invisible world. 2. The invisible world revealed by 
the microscope. 3. The Hydra or fresh-water polype. 4. The divis- 
ibility of vitality. 5, Cells the essential organs of life. 6. The Infu- 
soria or fresh-water animalcules. 7. The Polygastria. 8. The Monads. 
9. The Vorticellina or bell-shaped animalcules. 10. The Rotifera or 
rotating animalcules. 11. The Floscularia or flower-shaped animal- 
‘ecules, 192, Stephanoceros or crowned wheel animalcule. 13. The 
em wheel animalcule. 14. Animalcules with durable cases or 
— 35; Reflections. 16. General maiiet, Conclusion, Appendix, 
+ 
