The commissioner may accept and act upon the opinions, appraisements and reports of any engineers, appraisers, or other experts which may be presented by an applicant on any question of fact concerning or affecting the securities proposed to be offered and sold. In lieu of, or in addition to, such opinions, appraisements, and reports, the commissioner may have any or all matters concerning or affecting such securities investigated, appraised, passed upon and certified to him by engineers, appraisers, or other experts selected by him.