Sunlight. 33 



fluid, is a substance is not questioned. The 

 so-called heat-lightning, though apparently 

 intangible, must therefore be regarded as a 

 substance. Yet further in the remove we 

 find the zodiacal light. Sunlight is but the 

 same, in form of extreme tenuity. The thun- 

 derbolt passes from earth to cloud, and in- 

 stantaneously changes its substantial form to 

 one as tenuous as light ; yet, in the trans- 

 formation, this fluid has not lost its identity. 

 Though unseen, it continues to exist as mat- 

 ter. 



Velocity of Light. 



While ever present, light is being inces- 

 santly replenished ; its action being instanta- 

 neous. The calculations of ROEMER, founded 

 upon observations made through spaces of 382 

 and 568 millions of miles of distance, should 

 not be too confidently accepted, especially as 

 the results of such conclusions are so vitally 

 important. When we consider that with our 

 best telescopes directed towards the moon, 

 less than a quarter of a million of miles dis- 

 tant, nothing really satisfactory may be dis- 

 cerned, what value, therefore, may be attached 

 to statements founded upon such thoroughly 

 unreliable data ? 



2* 



