If such jury should be unable to agree upon a verdict, or for any cause should fail to render a verdict, said probate court shall, on the application of the city attorney, designate some day and hour when another jury may be impaneled, and such other jury shall be obtained, drawn, summoned, returned, bound to attend and serve, have the same qualifications, be sworn, and when sworn have the same powers and duties as the first jury. The same proceedings after they are sworn shall be had by them, and by and before said probate court as provided for above after the first jury is sworn.