96 GRAVITATION. 



Can you name any of the general laws of gravitation ? 



What is the general character of these laws ? 



Can the force of gravitation be in any way intercept- 

 ed 1 Can it be weakened 1 



Is the whole amount of attractive force exerted by any 

 body the same on different distances 1 



Is that part which is exerted at different distances, 

 upon the same body, the same 1 



Can any reason be given why bodies should attract 

 each other 1 



Mention some of the leading particulars in Newton'3 

 Life? 



ADVERTISEMENT. 



CARTER, HENDEE & BABCOCK, 



BOSTON, 



HAVE LATELT PUBLISHED 



AN ELEMENTARY TREATISE' ON 



GEOMETRY, simplified for beginners not versed in Algebra. 

 Part 1, containing PLANE GEOMETRY, with its application to the 

 Solution of Problems. By Francis J. Grund. Second Edition. 

 Extracts from the Preface. 



Popular Education and the increased study of Mathematics, as 

 the proper foundation of all useful knowledge, seem to call espe- 

 cially for elementary treatises on Geometry, as has been evinced in 

 the favorable reception of the first edition of this work wirhin a few 

 months of the date of its publication. A few changes have been 

 made in the present edition, which, it is hoped, will contribute to 

 the usefulness of the work as a book of elementary instruction. 



'As regards the use of it in schools and seminaries, the teacher 

 will find sufficient directions in the remarks inserted in the body of 

 the work. 



At a late meeting of the School Committee of the city of Boston, 

 Mr Grund's Geometry was recommended as a suitable book to be 

 used in the Public Schools. Similar testimonials of the merits and 

 usefulness of the work have been received from Teachers and 

 School Committees, in various parts of New England. 



C. H. & B. have in press and will publish in a few weeks, ' A 

 Treatise on Solid Geometry, by Francis J. Grund : intended as a Se- 

 quel to the ' First Lessons in Plane Geometry.' Apparatus has 

 been prepared by Mr Josiah Holbrook, calculated to illustrate the 

 Problems contained in the abore work. 



