1. There is a preponderance of the group of epidermoid carcinomata among smokers as against Adenocarcinomata

2. Glycoprotein abnormalities in colonic carcinomata, Adenomata, and hyperplastic polyps shown by lectin peroxidase histochemistry

3. Ten lectins with differing carbohydrate binding specificity were tested against 20 normal rectal biopsy specimens and tissue from 19 colonic carcinomata, 19 tubular or tubulovillous Adenomata, and 19 hyperplastic polyps.