(9.) Plans which are approved of by the committee and afterwards ratified by the general meeting of the urban authority, should be carefully put away in pigeon-holes, so that by means of the reference book previously described they can be easily found at any future time. This is very important, as no extension of a building the plans of which have been thus approved by the urban authority can ever afterwards be carried out without their consent; and the plans of any alteration which would not involve building upon an increased area must be deposited as in the case of a new building. (10.) A notification in writing should be sent to the person who has deposited the plans when they have been approved by the urban authority; and in sending this notification it is well to draw his attention to the fact that notice must be given to the surveyor of the commencement of the work, in order that the foundations, drains, &c., may be examined by him before the ground is filled in. The importance and necessity for the deposit of plans with a sanitary authority cannot be over-estimated, but this deposit is of but little practical good unless it can be insured that all the buildings are erected strictly in conformity with these plans, and this, according to the Act, is the duty also of the town surveyor. As a matter of fact, it is quite impossible for any single person in any large town to perform this duty, and a staff of assistants is consequently necessary if the sanitary authority really wish their byelaws to be enforced. Anyone who is practically acquainted with the difficulties that even architects experience in superintending buildings they have _themselves_ designed, and how much they have to trust to the clerk of works (of which there is generally one to every building), will readily see what an absurdity it is to suppose that a town surveyor, with his multitude of other duties and attendances at committees and meetings, can even pretend to see that the 99 detail clauses of such byelaws as those emanating from the Local Government Board Office, or even those of a less stringent character, can possibly be enforced, especially when it is remembered that many of the buildings he has to inspect have no superintending architect, but are being erected for purposes of speculation by what are commonly known as jerry builders. Laws may be passed, books on sanitary questions may be written, but until a change is made in the machinery and manner of the inspection of buildings in the course of erection, and a large staff of inspectors or sanitary police or some such officials are kept by a sanitary authority, very little real advancement will be made with the poorer classes of buildings.