Biological Lectures Delivered at the Marine Biological Laboratory of Woods Hole

activities algae Amblyopsis animal annelids appears archegonium Arenicola associations become bilateral blastomeres blastula body carbon cause cells central spindle centrosome character chemical chemotaxis chick chromatin chromosomes color condition connected cytoplasm definite differentiation direction division ectoderm eggs embryo evidence evolution experiments fact female ferns fertilization fibers fish form of cleavage formation fungus gametophyte genetic germs glands granules habits haemolymph heredity Hertwig higher plants hypothesis impulse instinctive intermittent later layer liverworts mass material mesoblast Metazoa mitosis muscle mycorrhizas nature Noctiluca nucleus observations occur ontogeny organism origin Paramecia Paramecium phenomena phylogeny piece pigment posterior probably produced protoplasm Protozoa Pteridophytes reaction reflex regeneration relation result sea water secretion secretory nerves side similar situation somatic plate species spermatozoa sphere sphincter spiral spiral cleavage sporangia spores sporophyte stages stimulus structure substance surface temperature theory tion tissue unicellular valley Zool