WELLS'S 



^^s.--^ 



NATURAL PHILOSOPHY; 



USE OF SCHOOLS. ACADEMIES. AND PLIYATE STUDEHS. 



Dmosucisa 



THE LATEST RESULTS OP SCIE-VTITIC DBCOVERT AKD RESKAfiCH; 



JLHRAITGED WITH SPECIAL REFEEEifCE TO THE PRACTICAL 



AJTUCATIOX OF PHYSICAL SCIEKCE TO THB ABTS ASD 



TUB EIPERIESCE3 OF ETEBY-DAT LITE. 



AiTH THREE HUNDRED AND SEVENTY- FIVE ENGRAVINES 



DAVID A. WELLS, A.M., 



ATTBOB 07 " Tin: BCTSSCZ OF COStMOJ* THr«fG»," EDITOB OF TffE " AXTTOAL 01 

 aClESTinO DlflOOVIBT," " K.V0»-LEIXJE 18 P0Wi3," ETC 



upteexth editioh eetised. 



XEW TOEK: 



IVISON, BLAKEMAX, TAYLOR, & COMPACT?, 



138 & 140 GRA^-I> Street. 



CHICAGO: 133 & 135 STATE STREET. 



1873. 



