I have had some misgivings and doubts on one aspect of the matter. That is the extent of the denotation of the word "gas" where it is used in s. 418 (1) (b) of the Local Government Act along therewith the words "gas fittings and appliances". I think that the phrase "the supply of gas" in its context in the Act of 1919 probably means the thing that it had meant in the forerunners of that Act, earlier statutes of New South Wales dealing with the powers of local governing authorities. That thing was coal gas. The word is not limited to gas for heating and lighting appliances. Therefore it must be read, it seems to me, as meaning either all types of chemical gases or as limited, as it was previously limited, to coal gas. Other types of gas can be bought and sold in containers; and if the power is a general power to provide gas of any sort and the supply of gas means any sort of gas I see no reason why it should not include petroleum gas. Whether gas be supplied in containers or in some other way is not, I think, a decisive consideration. The powers which the council has under s. 418 are to supply a variety of things by way of business and trade. They vary from ice to gas to motor bus services. I am not myself persuaded that the question here is one of a generic word as distinct from a specific word. It seems to me that only one species of gas was being spoken of when the phrase "the supply of gas" was used in the Act, having regard to the use of the word in other statutes, in pari materia, and to the common use of the phrase "gas supply" in 1919 and before then.