April 1, 1864.] THE TECHNOLOGIST. 



LABORATORY NOTES. 429 



found in Laguna, Bataan, Cavite,and Pangasinan, splits in large splinters, 

 shaving fine, smooth, and twisted. 



The following woods are used in Cuba for railway sleepers. Guy- 

 acan (Guiaacum officinale). Guyacancillo (same kind but smaller). 

 Quiebrahacha, a very hard wood that breaks the axe. Azaro (this 

 name signified anciently sarcocolle). Jiqui and Jiguelete (must be a 

 leguminous plant, Jiqui is a name given in Spanish America to the 

 indigo). Guama de costa and Jucaro negro. 



LABORATORY NOTES. 



museum of irish industry, dublin. 



Examination op the Coals Employed in the Manufacture of 



Gas. By James Dunne, Student in the Evening Class for Practical 

 Chemistry. 



I. — Boghead Cannel Coal. 



Specific gravity of the coal .... 1*184 



Proximate Composition of the Coal. 



Water 1-55 



Volatile matter 62-09 



Fixed carbon (coke) 18-20 



Ash . . J8-16 



100-00 



Amount of sulphur in volatile portion . . 0'616 



Amount of sulphur in non-volatile portion . 0'133 



Total Amount of sulphur in 100 parts . 0-749 



Percentage of Nitrogen 0'84 



II. — Mickley Coal (Newcastle). 



Specific gravity of the coal .... 1*26 



Proximate Composition of the Coal. 



Water 0*59 



Volatile matter . . . . . . . 35-86 



Fixed carbon (coke) 61-42 



Ash . 2-13 



100-00 



Amount of sulphur in volatile portion . . 0-352 



Amount in non-volatile portion . . . 0*3 14 



Total amount of sulphur in 100 parts 0-666 



Percentage of nitrogen 1*48 



III. — Newcastle Pelton Main. 



Specific gravity of the Coal .... T243 



