89 



SlMXGIA ATnWDATA. Plate XXII. 



subject was found in a pond by the roadside, near Craigleith. 

 in August 1838. 



This substance, I understand, invest* stones, and separates in a stra- 

 tum of an eighth of an inch in thickness. It is of a dingy yellow colour, 

 much resembling a piece of chamois leather. 



Numerous whitish spherules are dispersed throughout the substance. 

 When suspended in water, they swim moderately, with a revolution in 

 a vertical axis. 



PLATE XXH. 



FlOS 1.-17. Sfxmw atlfnuala. 



