Prouty, S. F. Report under H. R. 746 [756, authorizing committee to conduct investigation of affairs of office of superintendent of insurance of District and of certain fire insurance companies doing business in District, in relation to refusal of R. W. Power to testify to matters under inquiry] and certificate of speaker [of House to district attorney of District of Columbia in regard to this fact, so that said officer shall bring matter before grand jury of District of Columbia for further action].