June ], 1864.] THE TECHNOLOGIST. 



LABORATORY NOTES. 523 



Proximate Composition of the Coke. 



Water 0.25 



Volatile combustible matter .... 533 



Fixed carbon (coke) 9064 



Ash 3-78 



100-00 



Amount of sulphur in 100 parts of the coke . 0792 



Percentage of nitrogen 0.285 



Specific gravity of the coke . , . . 1-891 



Determination op the Specific Gravity of Specimens of 

 Different Kinds of "Wood from British Gqiana. By William 

 Plunkett, F.C.S., Assistant Chemist. 



1. Turiballi, Eurebally,or Guiana Mahogany. — Specific gravity, 074; 

 weight of 1 cubic foot, 46-3 lbs. 



2. Greenheart, or Spiri. — Specific gravity, P08 ; weight of 1 cubic 

 foot, 67-5 lbs. 



3. Sirebadany. — Specific gravity, 0"98 ; weight of 1 cubic foot, 

 61-3 lbs. 



4. Suradani, or Dalina. — Specific gravity, 0'77 ; weight of 1 cubic 

 foot, 48-1 lbs. 



5. Banya, Bannia, or Guiana Ebony. — Specific gravity, 1"23 ; weight 

 of 1 cubic foot, 76*8 lbs. 



6. Purple Heart, or Courabarilla.— Specific gravity, 0'69 ; weigbt of 

 1 cubic foot, 431 lbs. 



7. Carisiri, Carra-Seri, or Black Lancewood. — Specific gravity, 

 070 ; weight of 1 cubic foot, 43'8 lbs. 



8. Brown Siloerballi. — Specific gravity, 0'57 ; weight of 1 cubic foot, 

 35-6 lbs. 



9. Duculiballi. — Specific gravity, T02 ; weight of 1 cubic foot, 

 63-8 lbs. 



10. Kretti, or Bastard Silverballi. — Specific gravity, 0.44 ; weight of 

 1 cubic foot, 27'5 lbs. 



11. Horbaballie, or Surinam Snakewood. — Specific gravity, 071 ; 

 weight of 1 cubic foot, 44-4 lbs. 



12. Breadnut. — Specific gravity, 053 ; weight of 1 cubic foot, 

 33-1 lbs. 



13. Mora. — Specific gravity, 1-1 ; weight of 1 cubic foot, 68'8 lbs. 



14. Hyaroabally. — Specific gravity, 1-07 ; weight of 1 cubic foot, 

 66-9 lbs. 



15. Bully Tree. — Specific gravity, 172 ; weight of 1 cubic foot, 

 70-0 lbs. 



16. Letter Wood, or Brazil Wood. —Specific gravity, 1*36 ; weight of 

 1 cubic foot, 85 lbs. 



