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21. Conversion of desthiobiotin into biotin or biotinlike substances by some microorganisms.

22. The Interrelationship of iron and certain accessory factors in the growth of Rhizobium trifolii, strain 205.

23. Control of sexual reproduction in Phytophthora cactorum.

24. The Effect of auxins upon Phytophthora cactorum.

25. Studies on the nutrition of fungi. IV. Factors influencing the growth of some thiamin requiring fungi.

26. Studies on the nutrition of fungi. V. Factors affecting zygospore formation in Phycomyces blakesleeanus.