Section 50. Conservator may, in cwtain cases, ascerhin draught, and

50. Conservator may, in cwtain cases, ascerhin draught, and charge expense to Master. 51. Tonnage of ypssel liable to port-dues how ascertained if registered ; if not registered. 52. On refusal to pay port-dues, &c., the Collector may distrain and sell. 53. No port-clearance to be granted until dues, &c., are paid. 50. If any vcssel liable to the payment of portdues is in any such port without proper marks on the stem and stern-posts thereof for denoting her draught, the Conservator may cause the same to be ascertained hy II~P~RJIS of tlie 01,e~a,t,ioii of liooki~~g, and thc >!aster of such vessel shall be liable to pay the expenses of such operation. Conser~ato~ may In certain cases ascertain draught, and charge expHme Lu Master.