SCIENTIFIC LIBEAEY FOR TOUNG PEOPLE. 



C.EOLOGY. 



By the Rev. T. G. Bonney, M.A., F.G.S., Fellow and late Tutor of St. John's 

 College, Cambridge. 



In the following pages I have attempted to set down briefly the principal facts 

 of Geology, and the conclusions which have been drawn from them ; to indicate the 

 nature of the earth's crust, the processes which have acted and are still acting upon it, 

 and the probable history of that little portion of it on which we live. I was requested, 

 before commencing my task, to avoid the use of long words and the discussion of 

 doubtful points, and have done my best to attend to this request. Author's Preface. 



CRYSTALLOGRAPHY. 



By Henry Palin Gurney, M.A., Clare College, Cambridge. 



Crys allography has been hitherto strangely neglected in this country as a branch 

 of education. Its great importance to the chemist, the physicist, and the geologist cannot 

 be questioned, and it is full of interest for all. No study is better calculated to sharpen 

 at once the observing and the reasoning faculties of youth. There is nothing repulsive 

 in crystals. Their beauty is often more attractive, as it is more enduring, than that 

 of the fairest flowers. Their symmetry illustrates the rhythm and the harmony that 

 pervade the universe. They have already suggested the most important law of modern 

 chemistry. They tell us more about the properties of atoms than any other form of 

 substance. Author's Prefaci. 



SPECTROSCOPE, THE WORK OF THE. 



By Richard A. Proctor, Esq. 



I have endeavored to make this little treatise on the Spectroscopic Analysis clear and 

 simple for beginners, but at the same time accurate, and as complete as possible within 

 so limited a space. * * * I have endeavored to give a full account of all the prin- 

 ciples on which the application of spectroscopy depends, and also of all the chief 

 methods of observation and their results. Autlwr's Preface. 



ELECTRICITY. 



By Fleeming Jenkins, F.R.S., Professor of Engineering in the University of Edin- 

 burgh. 



Gives the most recent views of scientific men, and an account of the latest dis- 

 coveries and the principles upon which they are founded such as the telephone, 

 microphone, photophone, etc. 



Jg^'These ten volumes ftrm the most complete popular Scientific Library now 

 accessible to the student. If the ten volumes are ordered at one time they will be sent 

 free to any part of the country for $3.50. 



INDUSTRIAL PUBLICATION COMPANY, 



14 I>ey Street, New York. 



