PHYSICAL SCIENCE 



XXVI. Reasons of apparent movements of Comets. The transparence 



and shape accounted for ....... 299 



XXVII. Parallels to the differences between Comets and other 

 planets 300 



XXVIII. Comets give prognostications, but not of immediate events 



or weather .......... 302 



XXIX. Denial of heaviness and slowness of Comets . . . 303 



XXX. Humility is as becoming in investigators of the nature of the 

 heavens as in worshippers. God has revealed but a little of 

 Himself to man . . . . . . . . . 304 



XXXI. One cannot be surprised that everything has not yet been 

 discovered. We must leave something to succeeding genera- 

 tions. We are not yet fully proficient in vice, though we have 

 striven so long and hard. We still retain, strange to say, some 

 traces of manhood * ... . . . . . 305 



XXXII. We are all given up to low pleasures and vices, and devote 

 our strength to them. Philosophy is kept for wet days. The 

 old teachers have no successors. In fact, we are letting go what 

 they discovered. We at best play with truth, which, as of old, 

 lies at the bottom of the well, and needs the best efforts of 

 young and old, late and early, to bring it to light . . . 307 



NOTES BY SIR A. GEIKIE ........ 309 



TRANSLATOR'S NOTES ON "AiR," QUOTATIONS, AND GERCKE'S 



READINGS .......... 344 



INDEX 351 



