would have done if they had not thought that they were com-
petent to lay down the arbitrary rules for ascertaining the weights of loads. That the object of the rule is that weights shall be ascertained by measurement is clearly shown by the next paragraph of the by-law, which authorizes any member or officer of the municipality or any police officer to stop all loaded vehicles for the purpose of ascertaining the weight of the load carried thereon-obviously by inspection and measurement, for weighbridges are not available all over the district. So that, on the by-law as it stands, the prosecutor failed to establish his case.
But there is another and more serious objection which is of general importance, and to which I must refer. The Local Government Act 1910 by sec. 205 (13), Pl. 6, authorizes the Council to make by-laws prescribing, amongst other things, the width of, and other conditions respecting, the tyres of wheels of vehicles in the municipality, either with respect to the weight of the load carried, or with respect to the diameter of the axles of such vehicles." This by-law does not deal with the diameter of the axles, but only with the question of weight. The only authority given in this regard is to prescribe the width with respect to the weight of the load carried. That means real weight, not supposed or notional or imaginary weight prescribed by rules laid down by the municipality. But that is not the by-law they have made, unless the second part of it, prescribing the standard of comparison between measurement and weight, can be severed from the rest. It is impossible as the by-law is framed SO to sever it. If we held that it could be severed we should in fact be making quite a different by-law from that which the Council themselves made.
The by-law as it stands is invalid, and we cannot hold that the respondent should have been convicted upon the ground that, if it had been differently framed, SO as to be valid, he would have been guilty of a breach of it. It may be, and probably is, the fact that rules for ascertaining weight by measurement are of great con- venience. It appears from the case cited by Mr. Clarke that in New Zealand local authorities are authorized by law to lay down