THE MEDICAL SUPPLY ASSOCIATION 



(Electrical Dept.) 



ACTUAL MANUFACTURERS of 

 Scientific Electrical Apparatus 



167=185 ORAY'S INN RD., LONDON, W.C. 1 



High=Speed Static 

 Electrical Machines 



for Heavy Discharges 



Sizes 4 to 20 Plates. All Plates Revolving. 



SUITABLE FOR 



/LABORATORY USE, 

 PRODUCTION OF X-RAYS, 

 PROLONGED HJQH TENSION 



DISCHARGES, 

 ELECTRO.HORTICULTURE 



AND OTHER PURPOSES 



No covering is required, as the machine is unaffected 

 by climatic conditions. 



seud for static machine catalogue of 

 high-class, well-engineered machines. 



BRITI$H MADE THROUGHOUT IN OUR OWN WORKSHOPS. 



A CLIENT WRITKS reRarding our BRITISH BUILT 

 MACHINE: — "It is better than any other outfit I have seen. 

 If it is ail English made, then I am proud of the fact that English- 

 men .-ire not behind American and Continental houses in bunding 

 a fine piece of apparatus." 



E. E. GREVILLE, M.B., CM., Proprietor. 



The University of Chicago Press 



THE ORIGIN OF THE EARTH 



By 

 THOMAS CHROWDER CHAMBERLIN 



Head of the Department of Geology in the University of Chicago 

 (Fourth volume in the University of Chicago Science Series) 



This book, by one of the leading geologists of the world, sets forth the disclosures 

 that led to the rejection, one after another, of the older views of the origin of our planet, 

 the futile attempts then made to emend these or to build others upon the same foundations, 

 the final rejection of all these, and the construction of a radically new view based on a 

 new dynamic foundation. The later chapters of the book treat of the early stages of 

 the earth and of the w ly in which its leading processes took their start from their cos- 

 mogonic antecedents, these being held to be essential factors in the genesis of the planet. 

 The beginnmg of the inquiry is set forth in the Introduction ; the sucoessive chapters 



are entitled : ^ The Gaseous Theory of Earth-Genesis in the Light of the Kinetic Theory 

 3"; "Vestiges of Cosmogonic States and their Significance"; "The Decisive 



of Gases 



xii + 272 pages, 12mo, cloth ; 6« net 



The Cambridge University Press 



Agents for the British Empire 



London, Fetter Lane, E.G. 4 



