120 Correspondence of J. Nickles. 
display phenomena of great interest bearing on the physical theory of 
c 
omets. 
Of the three comets discovered at Cambridge in America by Mr. Tut- 
tle, the first on the 4th of January, the third on the 2d of May, and the 
sixth on the 5th of September, the first is of peculiar interest, as its ele- 
ments are recognized as identical with those of the second comet of 1790 
discovered by Méchain. Mr. Bruhns of Berlin, who discovered this 
vations made up to the month of March in Europe and in America, and 
has deduced from them an elliptical orbit of 13°66 years. The comet 
discovered on the 4th of January by Mr. Tuttle has therefore returned 
four times since 1790 without having been seen. 
Statistical Prize—Of a number of prizes for statistics we notice an 
“honorable mention” decreed to Mr. Bérigny of Versailles for a work 
sun, the privilege of influencing the march of human generations. 
7 mental Physiology.—The great prize for Experimental 
ology was awarded to Mr. Jacubowitch for his treatise on the Znier- 
the parts of the nervous system were not hardened by chromic acid, but 
only by alcohol, and the slices were rendered transparent either by acetl¢ 
acid or some other convenient substance. 7 
_ The labors of Mr. Lacaze-Duthiers have contributed largely to the 
progress of most of the branches in the history of acephalous mollusks; 
