/'. A'. Smith. 



if. 7r.///x. ,1. r,,f. -jo?, //..>. 



MICROPHOTOGRAPHS OF CRYSTALS OF MERCUROUS SULPHATE. 



Magnification - 25O. 



igi. I, 5, 8. KieimreUr'it mttbod of |ira|rtHin. 



, S. 4. Cbemiml uwthnl of prapamtioo. 



8, 7. Kleutnilytio method of |tre|mntu>n. 



, 10. Puniioc ulphnric riil mctho<l of |>re|raliou. 



,. II. I'urchaiKl from Kmblteum. 



