6o 
OVSTERS AND DISEASE. 
PLATE \\\.— continued. 
Fig. 4. — Small piece of the mantle of green American oyster, after treatment with potassium ferro- 
cyanide, and then left overnight in clove oil to clear, showing an engorged blood channel 
stained red (Swift, i inch obj.). 
Fig. 5. — Section of the mantle edge of green American oyster, showing an engorged blood space, coloured 
after treatment with potassium ferrocyanide. 
Figs. 6, 7, 9. — Four similar sections of the mantle edge of a green American oyster, showing a large 
blood space engorged with green 'eucocytes (Zeiss, 35 mm. J. 
Fig. 6.— Unstained, showing the dull green tint. 
Fig. 7. — After potassium ferrocyanide. 
Fig. 8. — After ammonium sulphide. 
Fig. 9. — After pure haematoxylin. 
PL.ATE VIII. 
ILLUSTRATING THE HISTO CHEMICAL REACTIONS. 
Fig. \. — Leucocyte^ in the mantle of the American green oyster, unstained (Zeiss, apochr. 2 mm.). 
Fig. 2. — Another part of the same, treated with pure htematoxylin (Zeiss, apochr. 2 mm.). 
Fig. 3. — The same, treated with potassium ferrocyanide (Zeiss, apochr. 2 mm.). 
Fig. 4. — The same, treated with ammonium sulphide (Zeiss, apochr. 2 mm.). 
Fig. 5. — A blood space in the mantle filled with leucocytes, treated with potassium ferrocyanide 
(Swift, J inch). 
Fig. 6. — A similar blood space, treated with pure hicmatoxylin (Swift, \ inch). 
GEORGE PHILIP AND SON, PRINTERS, LONDON AND LIVERPOOL. 
