60 THE CHEMISTRY OF CREATION. 



pared paper. Thus, when the needles move, 

 they cause the reflected light also to move 

 a certain distance on the paper, and wherever 

 this light falls it leaves its mark in the dis- 

 coloration that instantly takes place. It has 

 also been proposed to copy objects in the 

 microscope by casting the image on prepared 

 paper. This would be highly useful. This de- 

 lightful art is called Photography, that is, 

 light-drawing, but it would be preferable to 

 style it Heliography or sun-drawing, since it is 

 the actinic rays, not the strictly light or lumi- 

 nous rays of the sunbeam which produce them. 

 Hitherto we can only be said to have perfectly 

 succeeded in producing pictures of one tint 

 alone; but some singular experiments have 

 been made, and are still in the course of pro- 

 secution, which seem to indicate that in time 

 it will be even possible to produce perfect pic- 

 tures, each object being represented in its natural 

 colours.* This would indeed be a triumph in 

 the science of light. 



The warm and pleasant sunshine then, gently 

 though it flies from hill to hill, and lies on 

 the valley and distant waters, is an agent of 

 astonishing power, and of the most vita] im- 



* Recent announcements have shown the possibility of 

 this. It is said that pictures have actually been taken im- 

 pressed with the natural colours of the objects. 



