Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDetermination of Growth-Rates by the Optical Lever Method.AuthorsBECK, WILLIAM A.AbstractRHYTHM was suspected to occur in the growth-rates of seedlings but it could not be detected with the ordinary microscopic methods. The method described here is promising and proved to be accurate and practical.PublicationNature, 1939, Vol 144, Issue 3653, p786ISSN0028-0836Publication typeArticleDOI10.1038/144786a0