1957 the head ........ in the respect of" the different and Tile United distinct heads of income, profits and gain, "salaries'', commercial Bank "Interest on securities", and "property'', "business" Ltd., Calcutta v. etc. is indicative of the intention of the legislature ne Commissioner making the various heads of income, profits and gains of Income-tax, II I · S · f · h west Bengal mutua y exc us1ve. o every item o mcome, w atever its source, would fall under one particular head l~apur J. and for the purpose of computing the income for charging of income-tax the particular section dealing with that head will have to be looked at. The various sources of income, profits and gains have been so classified that the items falling under those heads become chargeable under ss. 7 to 12 according as they are income of which the source is "salaries", "interest on securities", "property", "business, profession or vocation", "other sources" or "capital gains". Looked at thus the contetion of counsel for the Revenue that under the scheme of the Act and on a true construction of these relevant sections "interest on securities" by whomsoever and for whatever purpose held has to be taxed under s. 8 and under no other section is well founded and must be sustained It being a specific head of chargeability of tax, income from "interest on securities" whether held as a trading asset or capital asset would have to be taxed under s .. 8 and not under s.10 of the Act.