Two models were developed to evaluate total volume under and over-bark of Blackwood (Acacia melanoxylon R. Br.) stand trees. By variance analysis regarding volume with and without bark it was confirmed that trees age is responsible for 48 to 50% of its volumetric behaviour. Considered the averages of those variables and regarding the three homogeneous groups of the studied sites, a single model...

ABOUT THE AUTHORS: Peggy Cooper Davis is the John S.R. Shad Professor of Lawyering and Ethics at New York University and Director of its Experiential Learning Lab. Ebony Coletu is an Assistant Professor of Rhetoric and Composition at the American University in Cairo and Associate Director of the Experiential Learning Lab at New York University. Bonita London is an Assistant Professor of Psychol...

VIDENCE is accumulating to support the observation that the fitness of a E particular genotype in a given environment may be improved or impaired by the presence in that same environment of conspecific carriers of other genotypes. This has been shown in Drosophila pseudoobscura by LEVENE, PAVLOVSKY and DOBZ,HANSKY (1954), and BEARDMORE (1963) ; in D. melanogaster by LEWONTIN (1955) ; in D. busc...