XVI CONTENTS. 



On Halos and Parhelia > 172 



Fire 177 



Water 190 



Fountains or Springs 201 



The Tide* 209 



Days and Nights 214 



The Seasons 218 



Vegetables or Plants 226 



Earthquakes 239 



Volcanos 265 



TheEje 278 



Concoction 286 



The Circulation of the Blood 295 



Concluding Lesson 303 



Appendix, containing Additional Remarks on Heat, 



Cold, aud Light 311 



