REPORT OF THE SECRETARY. 61 
No. 750. “An Account of the Progess in Petrography, for the years 1887, 1888,” by 
George P. Merrill. (From the Smithsonian Report for 1888.) Octavo pamphlet of 
28 pages. 
No. 751. “‘An Account of Recent Progress in Dynamic Meteorology,” by Cleveland 
Abbe. (From the Smithsonian Report for 1888.) Illustrated with 7 figures. Oc- 
tavo pamphlet of 88 pages. 
No. 752. ‘“‘An Account of the Progress in Chemistry, for the years 1887, 1888,” by 
F. W. Clarke. (From the Smithsonian Report for 1888.) Octayo pamphlet of 29 
pages. 
No. 753. ‘‘An Account of the Progress in Mineralogy, for the years 1887, 1888,” by 
Edward §. Dana. (From the Smithsonian Report for the years 1887, 1888.) Octavo 
pamphlet of 20 pages. 
No. 754. ‘An Account of the Progress in Botany, for the years 1887, 1888,” by F. 
H. Knowlton. (From the Smithsonian Report for 1888.) Octavo pamphlet of 12 
pages. 
No. 755. ‘ An Account of the Progress in Anthropology, for the years 1887, 1888,” 
by Otis T. Mason. (From the Smithsonian Report for 1888.) Octavo pamphlet of 86 
pages. 
No. 756. ‘* Chronology of the Human Period,” by J. Woodbridge Davis. (From the 
Smithsonian Report for 1888.) Octavo pamphlet of 4 pages. 
No. 757. ‘“‘ Were the Osages Mound builders,” by J. F. Snyder. (From the Smith- 
sonian Report for 1888.) Octavo pamphlet of 10 pages. 
No. 758. ‘‘The Progress of Science as exemplified in the Art of Weighing and 
Measuring,” by William Harkness. (From the Smithsonian Report for 1888.) Oc- 
tavo pamphlet of 37 pages. 
No. 759. ‘‘ Determination of the Mean Density of the Earth by means of a Pendu- 
lum Principle,” by J. Wilsing. Translated from the German and condensed by J. 
Howard Gore. (From the Smithsonian Report for 1888.) Octavo pamphlet of 12 
pages, illustrated with 1 figure. 
No. 760. ‘‘ Derivation of the Name America,” by Jules Marcou. (From the Smith- 
sonian Report for 1888.) Octave pamphlet of 27 pages, illustrated with one map 
and 2 cuts. 
No. 761. “‘ Progress of Oriental Science in America during 1888,” by Cyrus Adler. 
(From the Smithsonian Report for 1888.) Octave pamphlet of 28 pages. 
No. 762. ‘“‘ Biographical Memoirs of Spencer Fullerton Baird.” (From the Smith- 
sonian Report for 1888.) Octavo pamphlet of 42 pages. 
No. 763. ‘Biographical Memoirs of Asa Gray,” by James D. Dana and William G. 
Farlow. (From the Smithsonian Report for 1888.) Octavo pamphlet of 81 pages. 
No. 764. ‘‘The Correction of Sextants for Errors of Eccentricity and Graduation,” 
by Joseph A. Rogers. Octavo pamphlet of 33 pages. 
No. 773. ‘‘The National Scientific Institutions at Berlin,” by Albert Guttstadt, 
translated from the German and condensed by George H. Boehmer. (From the Smith- 
sonian Report for 1889.) Octavo pamphlet of 56 pages. 
No. 774. ‘‘Hertz’s Researches on Electrical Oscillations,” by G.W.de Tunzelmann 
and by Frederic T. Trouton. (From the Smithsonian Report for 1889.) Octavo pam- 
phlet of 59 pages, illustrated with 19 figures. 
No. 775. ‘‘An account of the Progress in Meteorology for the year 1889,” by George 
E. Curtis. (From the Smithsonian Report for 1889.) Octavo pamphlet of 81 pages, 
illustrated with 1 figure. 
No. 776. ‘‘On the Movements of the Earth’s Crust,” by A. Blytt, translated from 
the Norwegian by W.S. Dallas. (From the Smithsonian Report for 1889.) Octavo 
pamphlet of 51 pages, illustrated with 1 figure. 
No. 777. ‘Timekeeping in Greece and Rome,” by F. A. Seely. (From the Smithso- 
nian Report for 1889.) Octavo pamphlet of 21 pages. 
No, 778. ‘‘ Biological Papers,” comprising ‘‘ Botanical Biology,” by W. T. Thiselton- 
