20 



SCIENTIFIC CATALOGUE, 



Birks (R. B.)—ON MATTER AND ETHER ; or, The Secret 

 Laws of Physical Change. By Thomas Raavson Birks, M.A., 

 Rector of Kelshall, Herts, formerly Fellow of Trinity College, 

 Cambridge. Crown 8vo. 5^. 6d, 



The author believes that the hypothesis of the existence ofy besides matter^ 

 a luminous ether y of immense elastic fore e^ supplies the true and stf- 

 ficient key to the re7naini7tg secrets of inorganic matter^ of the phe- 

 nomena of light, electricity, etc. In this treatise the author endea- 

 vours firsi to form a clear and definite conception with regard to the 

 real nature both of niatter and ether, and the hnus of mutual action 

 which must be supposed to exist between them. He then endeavours 

 to t7'ace out the main consequences of the fundamental hypothesisy 

 and their con-espondence zvith the known phenoniena of physical 

 change. 



Blanford (W. T.)— geology and zoology of 



ABYSSINIA. By W. T. Blanford. 8vo. 21^. 



This work contains an account of the Geological and Zoological Obser- 

 vations made by the author in Abyssinia, when accompanying the 

 British Ar7?zy on its march to Magdala and back in 1868, and 

 during a short Journey in Northern Abyssinia, after the departure 

 of the troops. Part /. Personal Narrative; Part II. Geology ; 

 Part III Zoology, With Coloured Illustrations and Geological 

 Map, ^^The result of his labours,^'* the Academy ^aj/j-, ^^ is an 

 important contribution to the natural history of the country, " 



Cooke (J 



P., J 



FIRST PRINCIPLES OF 



I 



CHEMICAL PHILOSOPHY. By Josiah P. Cooke, Jun., 



Ervine Professor of Chemistry and Mineralogy in Plarvard College. 

 Crown 8vo. izr. 



w ^ 



The object of the author in this book is to present the philosophy of 

 Chemistiy in such a form that it can be 7nade with profit the subject 

 of College recitations, and furnish the teacher with the means of 

 'testing the student' s faithfulness and ability. With this view the 

 subject has been developed in a logical order, and the principles of 

 the science are taught independently of the experimental evidence on 

 which they rest. 



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