CONTENTS. 



378^ 



141. Vapor pressures of methyl alcohol .... 



142. " " and temperatures: (a) carbon disulphide 



(d) chlorobenzine 

 (c) bromobenzine 

 (^) aniline . 



(e) methyl salkjX'late 

 (/) bromonaphmaline 

 (g) mercury 



143. Vapor pressure of solutions of salts in water 



144. Pressure of saturated aqueous vapor at low temperature over ice 



145. " " " " " " " " " water 



146. " " « " " o°t0 5o°C 

 147- " " " " " 50° to 374° C . 



148. Weight in grains of aqueous vapor in a cubic foot of saturated air 



149. " " grams " " " " " " meter of " " 



150. Hygrometry, vapor pressure in the atmosphere 



151. " dew-points .... 



152. Relative humidity 



153. Values of 0.378^ in the atmospheric pressure equation /i = B — o 



154. Table for facilitating the calculation of /i/ySo 

 ^55- Logarithms of ^7760 for values of A between 80 and 800 



156. Values of 1+0.00367 /: 



(a) for values of / between 0° and 10° C, by tenths . 

 {^) " " " " " - 90° '• + 1990° C, by tens 



(c) Logarithms for / "—49° " +399° C, by units 

 (^) " " " " 400° " 1990° C, by tens . 



157. Determination of heights by the barometer 



158. Barometric pressures corresponding to different temperatures of the 



boiling-point of water : 



(a) Common measure 



(d) Metric measure 



159. International Primary wave-length standard, Red Cd. line . 



160. " Secondary " standards Fe. arc lines . 



161. Additional standard Fe. lines 



162. Stronger lines of some of the elements .... 



163. Rowland's standard solar wave-lengths (also corrections) . 



164. Tertiary standard wave-lengths Fe. arc lines 



165. Wave-lengths of the Fraunhofer lines 



166. Photometric standards 



167. Intrinsic brightness of various lights 



168. Visibility of white lights 



169. Efficiency of various electric lights 



170. Sensitiveness of the eye to radiation of different wave-lengths 



(threshold) intensities 



171. Sensitiveness of the eye : greater intensities 



172. Sensibility of the eye to small differences of intensity (Fechner) 



low 



