516 TRANSACTIONS OF THE AMERICAN INSTITUTE. 



used as mordiint, owing to the affinity which the base has for the 

 textrile and coloring matters, and there is no tendency to further 

 reaction. Mr. Chaudet obtains the same result by putting in con- 

 tact "wiih the textrile matter, mordanted with bichromate of pot- 

 ash, a reducing body such as sulphurous acid, the alkaline sul- 

 phites, the organic acids, alcohol, sugar and its congeners, by 

 ■which chrome oxide is formed after which the substance is washed 

 and dyed the desired color. 



Heat conducting Power of Mercury. 

 M. Grisson has given to the French Academy the results of his 

 experiments. If the heat-conducting power of silver be taken at 

 100, that of mercury is onl}- 3.54 or aljout 28 times less than sil- 

 ver. Mercury conducts heat more slowly than any other metal, 

 and but little faster than marble and gas-coke. 



Eelation of Atomic Weights to Volatility. 



Bunseu's experiments sho^v that there is a close relation between 

 the atomic weights of certain compounds and the degree at Avhich 

 they become complete vapors. In the following table the first 

 column contains the name of the compounds; the second their 

 atomic weights; the third their degree of volatility; and the fourth 

 the result of the division of the numbers of the third column by 

 those of the second. 



Uthium-chloYide, {Lithamad) 42.49 0.739 0.0174 



Sodinm-chloride, (-8orZr«;^acO 58.43 1.001 0.0171 



Potassium-chloride, {Potamad) 74.57 1..288 0.0173 



Sodium-bromide, {Sodamcd)) 102.97 1.727 0.0168 



Potassium-bromide, {Potamab) 119.11 2.055 00.173 



lii\h\d\nm-c\i\oY\<\G,{Ruhamad) 120.82 2.183 00.181 



Sodium-iodide, (^'oJamay) ..150.07 2.360 0.0157 



Ccesiura-chloridc, (CWcrwr/cZ) .. .- .- 168.46 2.717 0.0161 



Potassium iodide, (Powm«v) 166.21 2.828 0.0170 



The close approximation of the numbers in the third column 

 leads us to surmise that the points of volatilization of these com- 

 pounds are directly as their atomic Aveights. 



Voyage of the Red White and Blue. 

 This little full rigged sailing vessel, only twenty-six feet long, 

 six feet two inches wide, with a depth of hold of tw'o feet ten 

 inches, tonning 2|| register, manned by Capt. John M. Hudson, 



