Abstract
Parahypon, cafergot and spasmocibalgin inhibited the nucleic acid synthesis and cell division in various concentrations used. This inhibitory effect was so total in the case of cafergot and spasmocibalgin that it was impossible to carry out any fur-ther cytological studies. Parahypon in diluted concentrations has a stathmokinetic effect. This led to the conclusion that parahypon, cafergot and spasmocibalgin have a major harmful effect upon the process of cell division in the meristematic cells of Allium cepa root tips.
