SCIENCE. 



the pupils' records of their own personal observations, it shows what 

 can be done by ordinary pupils under ordinary circumstances. 



By following the plan detailed, the teacher becomes simply a direc- 

 tor of the pupil's energies, thus inducing and cultivating the scientific 

 habit of thinking and working. The lessons will lead the pupils to 

 see the truth, state it, and at the same time to become practically ac- 

 quainted with common minerals, and to make collections of their own. 



The errors in language which result from simply reading books, or 

 hearing stories told, can be detected and remedied by carrving out the 

 design of these lessons. 



The lessons can be given during the ordinary school year of forty 

 weeks, by devoting one hour each week to the work. 



A list of simple apparatus needed, names of reference books, in- 

 formation on additional minerals, and a chapter on methods of form- 

 ing a mineralogical cabinet, are added. 



Specimens to Illustrate, from 50 cents to $10.00. 



Asa Gray, late Prof, of Natural 

 History, Harvard Univ.: Those who 

 have not had the advantage of the course 

 of lectures should study these primers 

 thoroughly, and follow the directions they 

 give. 



Albert H. Tuttle, Prof, of Zoology, 

 Ohio State Univ., Columbus: I have a 

 high esteem for the whole series. 



Dr. Win. T. Harris : I commend the 

 series for the kind of work which I think 

 ought to be done in the lower grades. 



