Image intensity variations can result from several di erent object surface e ects, including shading from 3-dimensional relief of the object, or paint on the surface itself. An essential problem in vision, which people solve naturally, is to attribute the proper physical cause, e.g. surface relief or paint, to an observed image. We addressed this problem with an approach combining psychophysica...

(1809-49)-American poet, short-story writer, and critic who is best known for his tales of ratiocination, his fantastical horror stories, and his genre-founding detective stories. Poe, whose cloudy personal life is a virtual legend, considered himself primarily a poet. William Wilson (1839)-A tale about a man's struggle with his conscience — an allegory in which William Wilson meets William Wil...

There are times when something is simply so familiar that we can no longer see it at all. It can be a story, or a concept, or even a flesh-and-blood person. Familiarity breeds not only contempt, but a kind of invisibility as well. For too many of us, such is the case with Sir William Osler. In his time (1849–1919), many considered him to be one of the greatest practitioners, teachers, and write...

Two of the note-books of William Beaumont, now in the possession of Washington University College of Medicine, have been reproduced, misspellings and all, in their entirety. The first of these note-books is Beaumont's medical note-book containing excerpts from medical authors, case histories, comments on Army medicine, prescriptions, and descriptions of methods for treating diseases. This note-...

With the death of A. W. Prichard, on January 13th, another old landmark of the medical profession in the West of England passed away. Born at the " Red Lodge," Park Row, Bristol, seventy-three years ago, he took a great deal of interest in this house, and during his life enriched its collection of old Bristol valuables by several gifts. He was the son of Augustin Prichard, a prominent surgeon o...

We describe Pad++, a zoomable graphical sketchpad that we are exploring as an alternative to traditional window and icon-based interfaces. We discuss the motivation for Pad++, describe the implementation, and present some of the differences between Pad++ and the standard Tk Canvas widget.

Este artículo puede ser consultado en versión completa en http:// www.medigraphic.com/actaortopedica William Heberden (Figura 1) nació en Londres en 1710, su padre era mesonero, sus primeros estudios los realizó en la escuela de gramática de la parroquia de St. Saviour en Southwark, una institución de la Reina Elizabeth que impartía educación gratuita. El director de esa escuela recomendó a sus...

Wiv regret to announce the death of Lieut-Colonel William Dunbar Sutherland, c.i.E., m.dv c.m., i.m.s., lately Editor of this Gazette, which took place at the Prince of Wales Hospital, Calcutta, on June 27th, 1920, after an operation for appendicitis, at the early age of fifty-three. William Dunbar Sutherland was born at Eucknow on the 13:th September, 1866. He was the son of Robert Sutherland,...