30 MORPHOLOGY OF BACTERIA. 
5. Van Ermengem’s Method. | 
(a) Prepare solution A as follows : 
Osmic «acid (2 per cent. solu- 
tion), I part ; 
‘Tannic acid (10 to 25 per cent. 
solution), 2 parts. 
To each 100 c.c. of the tannic acid add 4 or 5 
drops of glacial acetic acid. 
Fic. 15.—Bacterium Faschingii in blood; x tooo (Frankel 
and Pfeiffer). 
"Various modifications of Van Ermengem’s method have 
been suggested. See Centralbl. f, Bakt., Erste Abteilung, 
Bd. xxvii., Nos. 16-17, p. 597; and Lancet, vol. ii., No. 14, 
p. 874, 1898. 
