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The distances of three Sb galaxies NGC 224, NGC 2841 and NGC 7331 have been determined using the apparent size distribution of dark interstellar clouds in each of them.

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With 7 1:igurcs (Received 1981 Januar 25)Thc apparent radii of sonic HI1 regions in thc galaxics NGC 224, NGC 2403, NCC loo, NGC 598 and NGC 1313 were tlctcrmined. 'The size distribution of the apparent radii of the HI1 regions in these galaxies were studied. Two variants arc suggcstcd to determine thc distanccs of these galaxies. Thc reliability of these variants coultl bc sccn by comparison with tlic tlistnncrs tlctrrnminrtl by other methods.1;s wurtlen dic scheinbaren Radien ciniger HII-Gcbicte in dcn Galanicn NGC 224. 2403, 300, 598 und 1 3 1 3 bcstininit untl cleren GrBOenvcrtcilung untersucht. Zur l~ntfcrnun~sbestimniung dieser Galaxien wurdcn zwei Varianten angenonimen, dcren Zuvcrlassigkeit durch Vcrgleich nlit auf andere Wcisc bcstimniten Entfernungcn Rczeigt wird.

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