3G1 



taining the gold fluids, showed themselves as gold. The thinnest 

 layer of the fluid itself, however rich in particles, held between two 

 plates of glass, acted no otherwise than a layer of water. It appears 

 by the deflagrations that the particles of gold must be deposited in a 

 plane, and then, though discontinuous, they act in the manner of 

 continuous films of ordinary uncrystallized transparent bodies. 



As to the quantity of gold in the different films or solutions, it 

 can at present only be said that it is very small. Suppose that a 

 leaf of gold, which weighs about 0-2 of a grain, and will cover a 

 base of nearly 10 square inches, were diffused through a column 

 having that base, and 2' 7 inches in height, it would give a ruby 

 fluid equal in depth of tint to a good red rose ; the volume of the 

 gold present being about *the ^th part of the volume of the fluid ; 

 another result gave O'Ol of a grain of gold in a cubic inch of fluid. 

 These fine diffused particles have not as yet been distinguished by 

 any microscopic power applied to them. 



