» SCIENCE. 



No. XII. Common Minerals and Rocks. 



By W. O. Crosby, Professor of Mineralogy in the Mass. Inst, of Technology. 

 Illustrated with 40 figures. 200 pages. Price, paper, 40 cents. Cloth, 60 cents. 



This includes a brief and simple account of the. principal geologi- 

 cal agencies, descriptions of all the more common and important 

 varieties of minerals and rocks, and an explanation of the leading 

 kinds of structure occurring in rocks, such as stratification, etc. 



It is not merely a guide to teachers, but also a simple and logical 

 presentation of the leading facts and principles of structural geology. 

 It is well adapted for class use, and is already used in many schools. 



Specimens to Illustrate, from 50 cents to $10.00. 

 No. XIII. First Lessons in Minerals. 



By Ellen H. Richards, Instructor in Mineralogy, Mass. Inst, of Technol- 

 ogy. Paper. 50 pages. Price, 10 cents. A valuable introduction to Guide No. XII. 



These lessons were first worked out with three successive classes 

 of children, from six to eight years old, just out of the Kindergarten, 

 and then given to classes in two public schools in the city of Boston. 



No. XIV. Hints for Teachers of Physiology. 



By H. P. Bowditch, M. D., Professor of Physiology, Harvard Medical School. 

 Paper. 58 pages. Price, 20 cents. 



IN this little book an attempt has been made to show how a teacher 

 may supplement his text-book instruction by means of simple ob- 

 servations, and experiments on living bodies or on organic material, 

 thus imparting to his pupils a knowledge of the foundation on which 

 Physiology rests, and at the same time bringing the impressions made 

 on the senses to aid the memory in retaining the facts communicated 

 in a purely didactic way. 



No. XV. Observation Lessons on Common Min-^ 



erals. By Henry Lincoln Clapp, Master of the George Putnam School, 

 Boston. Paper. 80 pages. Price, 30 cents. 



THIS, little book is not an epitome of any work on mineralogy, nor 

 simply a collection of suggestions, but a specific, practical guide 

 for the use of the ordinary teacher. As it contains many transcripts of 



