SIMPLE DIRECTIONS 



TO A BEGINNER 



FOR 



PERFORMING THE EXPERIMENTS 



IN THE 



FOURTEEN WEEKS COUKSE 



IK 



CHEMISTRY. 



(OLD NOMENCLATURE.) 



[The large figures refer to the paere of the Chemistry, and the small ones to 

 the number of the experiment. Read for additional directions, Chemistry, 

 pp. 235-248, and new edition, pp. 245-267.] 



11. I. Put as much chlorate of potash (potassic chlorate) 

 as will lie upon the point of a knife-blade, and half as much 

 sulphur, into the mortar. Grind them slowly with the pestle 

 until the ingredients are thoroughly mixed and distributed 

 over the bottom of the mortar. Hold the mortar so that the 

 loose particles cannot fly into your eyes, nor the flame burn 

 your clothes, and then grind heavily with the pestle, when 

 rapid detonations will ensue. The mixture will last for days. 

 After use, clean out the mortar carefully for other experi- 

 ments. The powder can be wrapped with paper into a hard 

 pellet and exploded on an anvil by a sharp blow from a ham- 

 mer. Sometimes small bits of phosphorus are used instead 

 of sulphur. Great care is then necessary, as the particles of 

 burning phosphorus are apt to fly to some distance. 



12. i. Two teaspoonfuls of common carbonate of soda and 

 one of tartaric acid should be dissolved separately in a wine- 

 glass of water. On being poured together in a larger glass, 

 they will violently effervesce. Use a glass large enough to 



