The Probable Explanation of Low Transmission Ratios of Certain Monosomic Types of Nicotiana Tabacum.

There are other factors which might be studied in relation to the beneficial effect of excess thiazole in the presence of limiting amounts of thiamin or molecularly equivalent quantities of its intermediates. However, it appears clear that the thiazole effect exists under many variations of the conditions under which Phycomyces might be grown in laboratory practice. This is important in the use of the organism in bio-assay because in the presence of excess thiazole dry weights greater by 50 per cent or more are obtained than would be expected on the basis of the amount of thiamin present.