THE TECHNOLOGIST: [June 1, 1864. 



524 COMPRESSED ASPHALTE. 



18. Yellow Silverlalli. — Specific gravity, 0*68 ; weight of 1 cubic foot, 

 42-5 lbs. 



18. Tiger Wood. — Specific gravity, 0-88 ; weight of 1 cubic foot, 

 55 lbs. 



19. Red Cedar-tree Wood. — Specific gravity, 0-58 ; weight of 1 cubic 

 foot, 36-3 lbs. 



20. Tablecushi, or Tibicusi. — Specific gravity, 1-30 ; weight of 1 cubic 

 foot, 81-3 lbs. 



Composition op Finzel's Crystallized Sugar. — By Wm. I. 

 Wonpor, Student in the Laboratory of the Museum. 



A fine sample of crystallized sugar, manufactured by Messrs. Finzel, 

 of Bristol, having been presented to this Museum, I made an analysis 

 of it at the suggestion of Mr. Galloway. There is some interest 

 attached to the analysis, as some refiners believe that the crystals con- 

 tain a quantity of water. This opinion is disproved, as I anticipated 

 by my analysis ; the sugar is, in fact, perfectly pure. The beauty, size, 

 and regularity of the crystalline form of the sugar, and its purity, prove 

 that science must have been reduced to practice in its manufacture. 



The analysis was made in the ordinary method. The sugar, in a state 

 of powder, was first dried at a temperature of 212 deg. F. ; this gave the 

 amount of water. A combustion of the dried sugar with chromate of 

 lead was then made, in order to obtain the quantity of carbon, hydrogen, 

 and oxygen. 



First Analysis. Second Analysis. Mean. 

 Percentage of Water . 0-0345 0-0507 0-0426 



The amount of carbon, hydrogen, and oxygen in the sugar when 



dried at 212 deg. 



F. :— 



First 



Second 









Analysis. 



Analysis. 



Mean. 



Theory. 



Carbon 



42-136 



41-754 



41-945 



42-105 



Hydrogen . 



6-420 



6-480 



6-450 



6-433 



Oxygen 



51-444 



51-766 



51.605 



51-462 



100-000 100-000 100-000 100-000 



COMPRESSED ASPHALTE. 

 At a recent meeting of the Society of Civil Engineers, at Paris, 

 M. Malo read a very interesting paper, " On Compressed Asphalte as a 

 Material for Roads." After referring to the defects inherent in the old 

 systems of paving adopted in the French capital, M. Malo treated of the 

 attempts which had from time to time been made to substitute some- 

 thing better. Of all the systems tried, however, he stated that but one 

 had borne the requisite tests, and that after a trying noviciate, extending 



