

PLATS 



iV.' 



Thousandths of an Inch. 

 Scalt >-r~ ,,,,. 1- i . 



Colouring matter used for injecting, showing the comparative size 'of the particles, a, precipitated chalk in a dry 

 state. 6, chalk recently precipitated c, "whitening, d, Prus-ian blue, as purchased, e, recently precipitated Prussian 

 blue. /, treshly precipitated carbonate of lead. y. dried carbonate of lead, h, freshly precipitated bimodide of 

 mercury, i, dried biniodide of mercury k, indigo. 1. vermilion, as purchased. t. levigated vermilion, p. pure 

 carmine n. dried chromate of lead. T, freshly precipitated chroraate of lead (hot solutions of bichromate of potas-b. 

 and acetate of lead), o, freshly precipitated chromate of lead (cold solutions), q. lamp black. X 215. p.99. 



Fig-. ieo. 



hatics injected with Prussian blue. From the portal canal Liver. Ox X 15. p. 102. 



[To face page TO. 



