1.Allium test has been performed with gallic acid as the testing chemical.2.Both excised and intact tips have been subjected to treatments, the time and concentrations to bring about, fragmentations have been found to be different in certain aspects in the two. The significance of the behaviour has been discussed.3.A certain concentration has been worked out to bring about the chromosome details, thus facilitating the study of chromosome morphology.4.Evidences brought forward show that fragmentations do not only indicate the subnarcotized conditions of the root, but at the same time the initiation of lethality.