Samples of human femora, vertebrae, and cranial bone have been tested in compression. The results of these experiments have been analyzed, taking into account observed anisotrophies and varying structures. Statistical correlations of properties have been made with density and a model that summarizes these results has been proposed. The cranial bone appear to be transversely isotropic and they are generally much stronger and stiffer in the transverse, or tangent to the skull, direction in comparison to the radical direction. The structure of the cancellous bone was found to be highly variable and this strongly influence many of the mechanical responses. The model, however, explains much of the observed variation.