1) The low boiling fraction of siliconmethylchloride reaction was cohydrolyzed with the three kinds of methylchlorosilane and the methylhydropolysiloxanes, MM′, M′-D′ DM′, M′ D 2 M′ 3 T and M′ 2 TD′ M′, have been prepared and characterized. 2) A complete series of linear methylhydropolysiloxanes, MD′ n M having three to eight silicon atoms have been prepared and characterized from the cohydrolyzate of methyldichlorosilane ...