Mortgages. Real estate mortgage taxes, hearings on H. R. 8080, to encourage building of homes by providing for exemption from taxation of income on mortgages on real estate, H. R. 14062, to encourage building of homes by providing for exemption from taxation of income on mortgages on real estate, and H. R. 14473, to relieve housing conditions by encouragement of investments in real estate mortgages, Dec. 11, 1920.