SCIENCE. 35 



Illustrations of Geology and Geography. 



For Use in Schools and Families. By N. S. Shaler, Professor of Palaeon- 

 tology, assisted by Wm. M. Davis, Assistant Professor of Physical Geography, 

 and T. W. Harris, Assistant in Botany, m Harvard University. 



CONSISTING of twenty large photographs and an equal number of 

 colored plaster models. The photographs are separately mounted 

 on suitable light frames, 15x20 inches in size. They represent a wide 

 range of terrestrial phenomena, seashores, valleys, glaciers, mountains, 

 volcanoes, caverns, etc. Alongside of each photograph is a detailed 

 description of the important points illustrated in the picture, with 

 occasional small diagrams, designed to show the detailed structure of 

 the field ; also references to the features in the models, which serve to 

 explain the facts shown in the view. 



The models, which are colored, are each 7x5 inches, and about 

 2 inches thick. One series shows the principal features of horizontal, 

 tilted, and folded stratified rocks, and the varied effects of river and 

 ocean erosion upon them ; others exhibit the process of development 

 of a volcano, of coral islands, of ocean shores, glaciers, etc. These 

 models are separately mounted on wooden backs, to which are appended 

 descriptions of the structures indicated, with reference to the photo- 

 graphs. 



In the text appended to both models and photographs, there are 

 abundant references to several text-books, where further information 

 may be obtained. They are large enough to be seen, when in the in- 

 structor's hand, by a class of thirty students. They are designed to 

 hang on the wall, and may, when necessary, be passed from hand to 

 hand without injury. 



The price of the full collection of fifty pieces, securely boxed for 

 transportation, is one hundred dollars. A smaller set, containing ten 

 models and ten photographs, will be sold at fifty dollars. When desired, 

 the collection will be divided, and the models or photographs sold sep- 

 arately ; the price for each set of twenty-five pieces will be fifty dollars. 

 Specimen copies of the models and photographs, one of each, to show 

 the nature of the method, will be sent by express, carriage paid, on 

 receipt of four dollars, which will be returned tm the receipt of the 

 objects in good order, or accounted for if the collection is taken. A 

 circular containing a detailed list of the models and photographs will be 

 sent on application. [Ready slug. I. 



