The National Series of Standard School-33ooks. 



NATURAL SCIENCE. 

 "FOUKTEEN WEEKS" IN EACH BEANCH, 



By J. DORMAN STEELE, A.M. 



Steele's 14 Weeks Course in Chemistry (New Ed.) 



Steele's 14 Weeks Course in Astronomy 



Steele's 14 Weeks Course in Philosophy 



Steele's 14 Weeks Course in Geology 



Steele's 14 Weeks Course in Physiology 



Steele's 14 Weeks Course in Zoology 



Our Text-Books in these studies are, as a general thing, dull and uninteresting. 

 They contain from 400 to GOO pages of dry facts and unconnected details. They 

 abound in that which the student cannot learn, much less reraember. The papil 

 commences the study, i3 confused by the fine print and coarse print, and neither 

 knowing exactly what to learn nor what to hasten over, is crowded through the 

 single term generally assigned to each branch, and frequently comes to the close 

 without a definite and exact idea of a single scientific principle. 



Steele's Fourteen Weeks Courses COD tain only that which every well-informed 

 person should know, while all that which concerns only the professional scientist 

 is omitted. The language is clear, simple, aud interesting, and the illustrations 

 bring the subject within the range of home life and daily experience. They give 

 such of the general principles and the prominent facts as a pupil can make famil- 

 iar as household words within a single term. The type is large and open ; there 

 is no fine print to annoy ; the cuts are copies of genuine experiments or natural 

 phenomena, and are of fine execution. 



In fine, by a system of condensation peculiarly his own, the author reduces each 

 branch to the limits of a single term of study, while sacrificing nothing that is es- 

 sential, and nothing that is usually retained from the study of the larger manuals 

 in common use. Thus the student has rare opportunity to economize his time, or 

 rather to employ that which he has to the best advantage. 



A notable feature ia the author's charming u style," fortified by an enthusiasm 

 over his subject in which the student will not fail to partake. Believing that 

 Natural Science is full of fascination, he has moulded it into a form that attracts 

 the attention and kindles the enthusiasm of the pupil. 



The recent editions contain the author's "Practical Questions" on a plan never 

 before attempted in scientific text-books. These are questions as to the nature 

 and cause of common phenomena, an-J are not directly answered in the text, the 

 design being to test and promote an intelligent use of the student's knowledge of 

 the foregoing principles. 



Steele's General Key to his Works- 



This work is mainly composed of Answers to the Practical Questions and Solu 

 tio-ns of the Problems in the author's celebrated "Fourteen Weeks Courses " i: 

 the several sciences, with many hints to teachers, minor Tables, &c. Should I* 

 on every teacher's desk. 



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