Section 61. The court shall, in addition to the proceedings before provided, require the applicant, upon oath or otherwise, in its discretion, to state the names of all persons known or supposed to be interested in the subject matter of the application, and shall in the commission direct the commissioner or commissioners to publish in such newspaper within or without the commonwealth, or both, or in such other manner, as the court orders, such notice of the time and place of taking such deposition and of the subject matter thereof as the court approves. Such notice shall be addressed by name to all persons who are known or supposed to be interested in the subject matter of the application, and generally to all others, and shall state that they may attend and propose cross interrogatories to the witness. The court may require additional personal notice of the time and place of taking and of the subject matter of such deposition to be given to such persons and in such manner as it orders.