Thomas de Keyser's Tätigkeit als Maler : ein Beitrag zur Geschichte des holländischen Porträts /

"Der Hauptteil des ... Buches wurde ... als Dissertationsarbeit gedruckt und ist hier im wesentlichen unverändert wiedergegeben"--Vorwort.

University of Michigan Football Team, 1911

Back Row: mngr. William Learmonth, Clement Quinn, George Thomson, Stanfield Wells, captain Fred Conklin, Thomas Bogle, William Otis, Richard Meek, Miller Pontius, Neil McMillan

Middle Row: George Paterson, Herschel Smith, Allen Garrells, Grover Herrington, Raymon Cooper, Herbert Hueble, Howard Kayner

Front Row: Otto Carpell, Henry Wenner, Ernest Allmendinger, Roy Torbert, Lawrence Roblee, Frank Picard

The visitation of the county of Warwick, begun by Thomas May, Chester, and Gregory King, Rouge dragon, in Hilary vacacōn, 1682. Reviewed by them in the Trinity vacacōn following, and finished by Henry Dethick Richmond, and said rouge dragon pursuiv in Trinity vacation, 1683, by virtue of several deputations from Sir Henry St. George, Clarenceux king of arms.

Report of the society for the year 1910 (3 p.) appended.

Festschrift zur Jahrhundertfeier der Universität Breslau am 2. August 1911,

Hilka, A. Liber de monstruosis hominibus orientis aus Thomas von Cantimpré: De natura rerum.--Schoenaich, G. Die neronische Christenverfolgung.--Winkler, H. Die Zugehörigkeit der finnischen Sprachen zum uralaltaischen Sprachstamm II.--Vogt, H. Geometrie und Ökonomie der Bienenzelle.--Schlossarek, M. Die Sprache des Terenz unter hauptsächlicher Berücksichtigung ihres rhetorischen Elements.

The report of Hiram Maxwell's case, decided at the City-hall of the city of New-York, on the 3d day of February, 1823 : with the speech and doctrine advanced by John A. Graham, L.L.D., on the practice of taking the examinations and confessions in the police office of prisoners charged with crime; together with the letters and opinions of many of the greatest and wisest philosophers, civilians, orators, and statesmen in the United States.

Contains only Graham's speech and letters concerning it, from John Adams, Thomas Jefferson, John Jay and others.

Thomas Love Peacock /

Includes bibliographical references (pages 273-277).

Thomas Young's contribution to visual optics : the Bakerian lecture "On the mechanism of the eye"

Thomas Young (1773-1829) carried out major pioneering work in many different subjects. In 1800 he gave the Bakerian Lecture of the Royal Society on the topic of the “mechanism of the eye”: this was published in the following year (Young, 1801). Young used his own design of optometer to measure refraction and accommodation, and discovered his own astigmatism. He considered the different possible origins of accommodation and confirmed that it was due to change in shape of the lens rather than to change in shape of the cornea or an increase in axial length. However, the paper also dealt with many other aspects of visual and ophthalmic optics, such as biometric parameters, peripheral refraction, longitudinal chromatic aberration, depth-of-focus and instrument myopia. These aspects of the paper have previously received little attention. We now give detailed consideration to these and other less-familiar features of Young’s work and conclude that his studies remain relevant to many of the topics which currently engage visual scientists.

Thomas Young’s contributions to geometrical optics

In addition to his work on physical optics, Thomas Young (1773-1829) made several contributions to geometrical optics, most of which received little recognition in his time or since. We describe and assess some of these contributions: Young’s construction (the basis for much of his geometric work), paraxial refraction equations, oblique astigmatism and field curvature, and gradient-index optics.

Thomas Young’s investigations in gradient-index optics

Purpose: James Clerk Maxwell is usually recognized as being the first, in 1854, to consider using inhomogeneous media in optical systems. However, some fifty years earlier Thomas Young, stimulated by his interest in the optics of the eye and accommodation, had already modeled some applications of gradient-index optics. These applications included using an axial gradient to provide spherical aberration-free optics and a spherical gradient to describe the optics of the atmosphere and the eye lens. We evaluated Young’s contributions. Method: We attempted to derive Young’s equations for axial and spherical refractive index gradients. Raytracing was used to confirm accuracy of formula. Results: We did not confirm Young’s equation for the axial gradient to provide aberration-free optics, but derived a slightly different equation. We confirmed the correctness of his equations for deviation of rays in a spherical gradient index and for the focal length of a lens with a nucleus of fixed index surrounded by a cortex of reducing index towards the edge. Young claimed that the equation for focal length applied to a lens with part of the constant index nucleus of the sphere removed, such that the loss of focal length was a quarter of the thickness removed, but this is not strictly correct. Conclusion: Young’s theoretical work in gradient-index optics received no acknowledgement from either his contemporaries or later authors. While his model of the eye lens is not an accurate physiological description of the human lens, with the index reducing least quickly at the edge, it represented a bold attempt to approximate the characteristics of the lens. Thomas Young’s work deserves wider recognition.