The toxic factors produced by Clostridium botulinum (Van Ermengem, 1896), types C and D were
determined. Monospecific antisera were prepared against the different factors. It was shown that type
Cα produces factors C₁ C₂ and D; type C ᵦ produces factor C₂ and type D produces factors C₁ and D.
It was also shown that the International Standard Type C Antitoxin contains antibodies against factors C₁,
C₂ and D and the International Standard Type D Antitoxin contains antibodies against factors C₁ and D.
The journals have been scanned in colour with a HP 5590 scanner; 600 dpi. Adobe Acrobat v.11 was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.