surgeon. In 1848 he was appointed Professor of Anatomy in the Aca- demy of Fine Arts at Berlin; in 1855 Professor of Physiology at K&nigsberg, whence he removed, in 1858, to Heidelberg, where he also filled the chair of physiology. He was afterwards appointed Professor of Physiology at Berlin. The works of M. Helmholtz, which are well known throughout Europe, have re- ference principally to the physiolo- ^cal conditions of the impressions on the senses. Among those most deserving of notice are : — " On the Preservation of Force," 1847;
- ' Manual of Physiological Optics,"
1856; and "Theory of the Im- pressions of Sound" 1862. His " Popular Lectures on Scientific Subjects," translated into English by Dr.E. Atkinson, were published in London in 1873, 2nd series, 1881; and his work on " Sensations of Tone, as a Physiological Basis for the Theory of Music," translated from the third German edition by Mr. Alexander J. Ellis, appeared in 1876. Professor Helmholtz has also contributed to scientific journals accounts of many of his ezx)eri- ments in acoustics, optics, and electricity. On Dec. 1, 1873, the Copley Medal of the Royal Society of London was awarded to him in recognition ot his eminent services to science.
HELMORE, Thi Rev. Thomas, M.A., son of a Dissenting minister, bom at Kidderminster, May 7, 1811, was educated at Magdalen Hall, Orford, where he graduated B.A. in 1840. Ho served for two years as curate in the parish of St. Mi- chael's, Lichfield, and held a priest- vicar's stall in Lichfield Cathedral. In 1842 he becai^e Vice-Principal and Precentor of St. Mark's Col- lege, Chelsea ; in 1846 was ap- pointed Master of the Children of Her Majesty's Chapels Royal, St. James's, &c. ; and in 1847 I^est in Ordinary to Her Majesty's Cha- pels Royal. In 1872 he was pre- sented to the Crown living of the
Rectory of Beverstone, which how- ever he resigned immediately after appointment. In 1877 he received a retiring pension from the Na- tional Society, after thirty-five years' service as Clerical Precentor of St. Mark's College. He is the author of "The Psalter Noted," " The Canticles Noted " (for chant- ing), " A Brief Directory of Plain Song," "Manual of Plain Song," also appendices and accomi>anying harmonies to all these. He was the originator and principal editor of "The Hymnal Noted," pub- lished imder the sanction of the Ecclesiological Society. In conjunc- tion with the late Rev. John Mason NeaJe, D.D., he edited " 12 Carols for Christmas," and " 12 Carols for Easter, from the Cantiones EcclesiasticoB of Peter Nyland, of Sweden" (1588). He has written "A Catechism of Music for use, with Dr. Hullah's Manual," Ac, 1878 ; translated " F^tis on Choir and Chorus Singing;" edited "The St. Mark's CoUege Chant Book," "The Canticles and Psalter Ac- cented," and "A Fuller Directory of the Plain Song of Holy Com- munion," 1881. ' He is the author of two papers on Church Music, one read at the Church Congress, Wolverhampton, Oct. 1867; and the other at Swansea, Oct. 1879 ; and has set to music some of Dr. Neale's translations of Hymns of the East- em Church ; " Peace, it is I," "The Day is Past and Over," and " 'TIS the Day of Resurrection."
HENDERSON, Lieut.-Col. Sib Edmund Ybamans Walcott, K.C.B., son of Rear- Admiral George Henderson, was born about 1820. Having passed through the ordinary course at Woolwich he entered the army in 1838, became Lieut.-Col. Royal Engineers in 1862, was for many years Controller of the Con- vict Department in Western Aus- tralia, and was appointed in 1863 to the offices of Surveyor-General of Prisons and Chairman of the Di- rectors of Convict Prisons. He was