Thesis (Ph.D.)--Boston University / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / The problem involves an investigation of apparent causal factors of algal periodicity. A swamp pond in a nearly mature stage of succession was chosen as the research site. Isolation was a primary consideration in site choice. Monthly collections of algae were made, taking the samples from an abundant, but select group, of aquatic plants. / 2999-01-01