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8. The Secretary to the Sanitary Board shall, upon the requisition of the Medical Officer of Health, or by direction of the President of the said Board, authorise in writing, in English and Chinese, one or more of the Board's officers to enter any domestic building at any hour between 6 P.M. and midnight, for the purpose of ascertaining whether such building or any part thereof is in an over-, crowded condition.
9. No officer of the said Board shall, between the hours of midnight and 8 o'clock the following morning, enter any domestic building for the purpose of ascertaining whether such building or any part thereof is in an overcrowded condition, without the written permission, in English and Chinese, of the Secretary countersigned by the President of the said Board."
10. The Secretary to the Sanitary Board shall furnish the Inspectors of Nuisances with general authority in writing, in English and Chinese, to enter, between the hours of 8 A.M. and 6 P.M., and inspect, upon reasonable notice to the occupiers or owners, any building and curtilage in their re- spective districts for the purpose of ascertaining the sanitary condition, cleanliness and good order thereof or of any part thereof, and of any partitions, mezzanine floors, stories and cock lofts therein, or of the condition of any drains therein or in connection therewith. If it shall be requisite, for the purpose of ascertaining the sanitary condition of any domestic building or curtilage, to open the ground surface of any part thereof any Inspector of Nuisances in possession of authority in writing signed by the Secretary to the said Board or by the Medical Officer of Health, after giving not less than forty-eight hours' notice in writing signed by either of the aforesaid officers to the occupier or owner of such domestic building or curtilage of his intention to enter the same for the purpose of opening up the ground surface thereof, may so enter, with such assistants as may be necessary, and open the ground surface of any such premises in any place or places he may deem fit, doing as little damage as may be. Should the material which has been used for covering such ground surface and the nature and thickness thereof, be found satisfactory and in accordance with law, such ground sur- face shall be reinstated and made good by the said Board at the public expense.
11. The occupier of any domestic building shall at all times cause such building to be kept in a cleanly and wholesome condition and see that the drains, traps, gratings, full-pipes and other sanitary fittings and appliances are kept free from obstruction and in an efficient state of repair; and he shall keep the windows and ventilating openings at all times free from obstruction unless prevented by inclement weather or by the illness of any person occupying such building.
12. Every occupier or householder of a domestic building shall cause all excremental matter to be removed daily from such building, to one of the public conservancy boats, by a duly registered night-soil carrier.
13. Every occupier or householder of a domestic building shall cause all domestic waste, refuse or other objectionable matter other than excremental matter to be removed daily from such building and taken to a public dust-cart or dust-bin.
14. The conditions under which alone it shall be lawful to live in, occupy, or use, or to let or sublet, or to suffer or permit to be used for habitation any cellar, vault, underground room, basement or room, any side of which abuts on or against the earth or soil, shall be that (1) such cellar, vault, underground room, basement or room fronts on a street which is of a clear width of not less than 8 feet free from any vertical obstruction whatever, and (2) that such cellar, vault, underground room, basement or room is provided with one window at least opening into the external air and that the total area of such window or windows clear of window frames shall be at least one-tenth of the floor area of such cellar, vault, underground room, basement or room, and (3) that no side of such cellar, vault, underground room, basement or room abuts against the earth or soil to an average height exceeding four feet above the floor level, and (4) that throughout the remainder of the height of such cellar, vault, underground room, basement or rooin the ground outside is at least 4 feet distant hori- zontally from the external wall of such cellar, vault, underground room, basement or room, and (5) that the area formed between such ground outside and such external wall is not obstructed or covered over either wholly or partially by the erection of structures, coverings or fixtures of any kind what- soever. Provided always that the Sanitary Board may, if it thinks fit, grant permission in writing to obstruct or cover such area in any manner which may be previously approved by the Board.
15. The conditions under which alone it shall be lawful to occupy or use, or to let or sublet, or to suffer or permit to be used for occupation as a shop any cellar, vault, underground room, basement or room any side of which abuts on or against the earth or soil shall be that such cellar, vault, under- ground room, basement or room complies with the provisions of the preceding bye-law, or that such cellar, vault, underground room, basement or room fronts on a street of a clear width of not less than eight feet free from any vertical obstruction whatever, and that such cellar, vault, underground room, basement or room does not exceed thirty feet in length, as measured from the front wall to the back wall.