In 1829 he went to Germany, and after studying at Gottingen and Berlin (where he came under the influence of Heeren, Ottfried Muller, Schleiermacher, Neander and Bdckh) he accompanied Bunsen to Italy and Rome.
(Gottingen, 1878); and A.
P. Woodward, a model of clear systematic exposition, and the exhaustive treatise on the Malacozoa or Weichthiere by Professor Keferstein of Gottingen, published as part of Bronn's Klassen and Ordnungen des Thier-Reichs.
C. Lichtenberg and published in one volume (Opera inedita, Gottingen, 1775).
It contains an easy and accurate method for calculating eclipses; an essay on colour, in which three primary colours are recognized; a catalogue of 998 zodiacal stars; and a memoir, the earliest of any real value, on the proper motion of eighty stars, originally communicated to the Gottingen Royal Society in 1760.