LECTURES 113 
November 25.— “Color vision and color photography.” 
December 2.— “Dispersion and absorption of light. Recent theories. 
Electrons.” 
December 9.— “Spectroscopy. Applications to chemistry and astronomy.” 
December 16.— “Polarization, with some applications to chemistry and 
molecular physics.” 
January 6.— ‘The exact laws of reflection and refraction and their 
bearing on the construction of optical instruments.” 
January 13.— “Optical properties of crystals.” 
January 20.— “The principle of interference and its explanation of vari- 
ous color phenomena.” 
January 27.— ‘The measurement of light waves and the theory of dif- 
fraction.” 
February 3.— “Some relations between light and electricity.” 
PEOPLE’S COURSE. 
GIVEN in coédperation with the City Department of Education. 
Saturday evenings at 8 o’clock. Doors open at 7:30. 
Proressor CHARLES BASKERVILLE, of the College of the City of New 
York,— the last of a course of six lectures on chemistry, illustrated by 
experiments and stereopticon views. 
November 7.— ‘‘Sodium, Potassium and Calcium, and Their Compounds.” 
PRoressoR BRADLEY StouGHTON of Columbia University,— a course of 
six lectures on metallurgy, illustrated by experiments and stereopticon views. 
” 
November 14.— “‘’The Metallurgy of Iron and Steel 
November 21.— “The Making of Iron.” 
November 28.— ‘The Making of Steel.” 
December 5.— “The Uses of Iron and Steel in Machine Shops and Bridges 
and other great Engineering Structures.” 
December 12.— ‘The Rolling and Forging of Iron and Steel.” 
December 19.— ‘The Heat Treatment of Steel.” 
Tuesday evenings at 8 o’clock. Doors open at 7:30. 
November 3.— Mr. CuHarves Everett Beane, “Newfoundland.”  Illus- 
trated by stereopticon views and motion pictures. 
November 10.— Mr.’ R. Corneuius Rasy, ‘“‘The Texan and His State.” 
Illustrated by stereopticon views. 
November 17.— Mr. Isaac F. Smrtu, “The City of Mexico.”’ Illustrated 
by stereopticon views. 
Mr. Cuartes M. PEpper, of the Department of Commerce and Labor, 
— four illustrated lectures on ‘‘The Twentieth Century South America.” 
November 24.— ‘‘ Panama to Patagonia.” 
December 1.— ‘‘Argentine, the World’s Wheatfield.” 
