372 PHILOSOPHICAL SOCIETY OF WASHINGTON. 
He spoke of the many newly discovered double stars, and of the 
spectroscopic measures of motions of 325 stars in the line of 
sight, and of the motions of the edges of Saturn’s rings. The 
velocity and direction of the motion of the solar system can be 
deduced from these measures, and the average velocity of the 
stars in the line of sight; this last is found to vary with the mag¬ 
nitude, increasing from 26 Km. sec. for stars of magnitude y 2 to 
39 Km. sec. for stars of magnitude 4 and smaller. Many fine 
photographs of»stellar spectra and nebulae were shown. The 
estimate was given that there are 120,000 nebulae in the heavens 
bright enough to be photographed with present means. 
533d Meeting. March 30, 1901. 
President Walcott in the chair. 
Twenty-nine persons present. 
The election and qualification of Mr. John C. Hoyt was an¬ 
nounced. 
Mr. J. B. Baylor read a paper on The magnetic survey of 
North Carolina, which has been carried on jointly by the State 
and the U. S. Coast and Geodetic Survey. Meridian lines were 
set at every county seat, and the total expense of the whole sur¬ 
vey for each county has been only $16.70. Isogonic charts were 
shown. [Published in U. Coast and Geodetic Survey Report 
for 1898-9, Appendix 9.] 
Remarks were made by Mr. Bauer. 
Mr. J. E. Watkins told of A century of land transportation 
by steam, narrating the development of rails, wheels, and loco¬ 
motives, with especial reference to early American practice. The 
first American-built locomotive appeared June 15, 1830. [Not 
published.] 
Mr. Lord, of Carbondale, Pa., by invitation gave some partic¬ 
ulars of the locomotive “Stourbridge Lion,” imported by the 
Delaware and Hudson Canal Company and now in the National 
Museum. 
Mr. A. C. Peale read A biographical sketch of Titian R. 
Peale, one of the Founders of the Society. [Published in this 
volume, p. 317.] 
