n8 Laboratory Arts 



of the broken portions before the oxy coal-gas flame, and small 

 extra pieces of the material may be added and fused in where 

 necessary. Some little practice at the work is necessary for 

 the securing of good results, but so far as small articles are 

 concerned, little difficulty will be experienced by a fair glass- 

 worker using bought silica rod and tubing. Large work is 

 extremely difficult to handle, and somewhat costly, owing to 

 the large amount of oxygen consumed. 



