A vegetação no município de Ilhéus, Estado da Bahia: I - estudo sinecológico das áreas de pesquisas sôbre a febre amarela silvestre realizado pelo S. E. P. F. A

I - Methods. II - Phytogeographic aspects. III - The communities and botanical associations: a) The lava Pés-Castelo Novo study area. b) The study area at the Pirataquissé farm. c) The Ribeirão da Fortuna study area. IV - Conclusions.

Mixed Hodge structures and vector bundles on the projective Plane I

We describe an equivalence of categories between the category of mixed Hodge structures and a category of vector bundles on the toric complex projective plane which verify some semistability condition. We then apply this correspondence to define an invariant which generalises the notion of R-split mixed Hodge structure and compute extensions in the category of mixed Hodge structures in terms of extensions of the corresponding vector bundles. We also give a relative version of this correspondence and apply it to define stratifications of the bases of the variations of mixed Hodge structure.

I. New species of Cuban Senecioneae. II. Diagnoses of new species and notes on other spermatophytes, chiefly from Mexico and Central America. By Jesse More Greenman.

v.2:no.8(1912)