By the same Author. 



MANUAL of PEOTOZOA: with a General 

 Introduction on the Principles of Zoology, and numerous 

 Woodcuts Fop. 8vo. 2^. 



'This first instalment of a series 

 of scientific manuals appropriately 

 describes a sub-kingdom of animals of 

 the simplest oi'ganisation, many of 

 which we have been accustomed to 

 associate with the lower members of 

 tlie vegetable kingdom. These hitherto 

 obscure beings are here briefly but care- 

 fully treated ; and within a compass of 

 less than a hundred pages a consider- 

 able amount of information about them 

 is conveyed, including the more recent 

 researches of minute and scientific 

 observers. The Spongidge, for example, 

 are clearly and concisely explained, and 



in a few paragraphs the dis- 

 coveries and opinions of several natur- 

 alists are noticed and made clear. This 

 part promises well for the whole series. 

 Each volume will, it is announced, con- 

 tain a condensed exposition of the 

 department of -science upon which it 

 treats,— and the subject-matter of these 

 Manuals will be so arranged as to ren- 

 der them suitable for students of 

 various degrees of proficiency as well as 

 for self-instruction. The present, as an 

 example, forms a good text-book for a 

 class of students.' Aihen-Sum. 



London : LONGMAN, GREEN, and CO. Paternoster Row. 



