THE MEDICAL SUPPLY ASSOCIATION] 



(Electrical Dept.) 



ACTUAL MANUFACTURERS of 

 Scientific Electrical Apparatus 



167-185 GRAY'S INN RD., LONDON, W.C.I 



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 HIGH TENSION 



DISCHARQES. 

 ELECTRO-HORTICULTURE 



AND OTHER PURPOSES 



No covering is required, as the machine ie unafTlecteci 

 by climatic conditions. 



SEND FOR STATIC MACHIHE CATALOGUE OF 

 HIGH-CLASS, WELL-ENGINEERED MACHINES. 



BRITISH MADE THROUGHOUT IN OUR OWN WORKSHOPS. 



A CLIENT WRITES regarding our BRITISH BUILT 

 MACHINE; — "It is better than auy other outfit I have seen. 

 If it is all English made, then I am proud of the fact that English* 

 men are not Iwbind American and Continental houses in building 

 a fine piece of apparatus.' 



Running cost ^d. per hour. 



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 ia the University of Chicago 



(Fourth volume in the University of Chicago Science Series) 



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

 that led to the i-ejeoticn, 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 fo\mdations, 

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

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

 the earth and of the WHy 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 beginning of the inquiry is set forth in the Introduction; the successive chapters 

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

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

 Testimony of Certain Vestiges of the Solar System " ; " Futile Efforts" ; " The Forbidden 

 Field " ; " Dynamic Encounter by Close Approach " ; " The Evolution of the Solar Nebula 

 into the Planetary System" ; "The Juvenile Shaping of the Earth" ; "^Tnner Reorganiza- 

 tion of the Juvenile Earth"; "Higher Organization in the Groat Contact Horizons." 



xii + 272 pages, 12mo, cloth; 6« net 



The Cambridge University Press 



Agents for the British Empire 



London, Fetter Lane, E.G. 4 



