[213] For ample information on the subject of house drainage and similar subjects see the following books, etc.:-- Bailey Denton’s ‘Sanitary Engineering’; Baldwin Latham’s ‘Sanitary Engineering’; Buchan’s ‘Plumbing’; Slagg’s ‘Sanitary Work’; Hart’s ‘Manual of Public Health’; Hellyer’s ‘Plumber and Sanitary Houses’; Galton’s ‘Healthy Dwellings’; ‘House Drainage,’ by W. A. Tylor; Philbrick’s ‘American Sanitary Engineering,’ and many others, besides the numerous reports of the “Health of Towns Commission,” and several articles in the _Sanitary Record_, the _Sanitary Engineer of New York_, and Mr. Rawlinson’s ‘Hints,’ all of which should be studied by the town surveyor. [214] In some parts of the north of England taper pipes are used about 20 inches in length, the internal diameter of the larger end being slightly greater than the external diameter of the smaller end, thus allowing the small end of one pipe to enter the large end of another. Continuous lengths of cement pipes made _in situ_ are also now being introduced. CHAPTER XXVII. PUBLIC PLEASURE GROUNDS AND STREET TREES. Amongst the clauses of the Public Health Act 1875 which affect the duties of the town surveyor will be found the following: “Any urban authority may purchase or take on lease, lay out, plant, improve, and maintain lands for the purpose of being used as public walks or pleasure grounds, and may support or contribute to the support of public walks or pleasure grounds provided by any person whomsoever. “Any urban authority may make bye-laws for the regulation of any such public walk or pleasure ground, and may by such bye-laws provide for the removal from such public walk or pleasure ground of any person infringing any such bye-law by any officer of the urban authority or constable” (38 & 39 Vic. c. 55, s. 164). There are very few, if any, cities or towns in this country that have not availed themselves of this clause, even if they did not already possess one if not more public parks or pleasure grounds of some description, these having either been given by some benevolent citizen or acquired in some other manner by the urban authority.[215] Included in the powers given by the above clause are no doubt those regulating the acquisition and support of recreation or public playgrounds, public walks, or old city walls or other places, and disused burying grounds.[216] In connection with the above clause of the Public Health Act, the town surveyor may have the following duties to perform: