INDEX.

497

Whey, Petruschky's, 136 @

Whooping-cough, 476
bacillus of, 476, 477
bacillus X in, 477

Widal serum-test for typhoid fever,
382, 383

Wolfhiigel's apparatus for count-
ing colonies of bacteria upon
plates, 169

Wooden tongue, 265

Wounds, unprotected, entrance of
bacteria into, 62

-AT-RAYS, effects of, on growth of
bacteria, 49

YEAST-PLANT as the cause of fer-
mentation, discovery of, 27
'62

Yellow fever, 399

antitoxic serum of, 408
bacillus of, 400. See Bacillus

icteroides.

coli communis in, 399, 400
bacillus X in, 400
cause of black vomit in, 404
causes of death in, 403
Havelburg's bacillus in, 405
pathology of, 405

ZIEHL'S method of demonstrating
the presence of tubercle ba-
cilli in sputum, 213

Zooglea, 148

Zoph's classification of the bacteria,

41
Zymogenic bacteria, 50