PRACTICAL HINTS TO NURSERYMEN 125 



22. Never put a new charge in a jar containing the 

 old residue. 



24. Never put sulphuric acid in tin or iron vessels ; 

 it will eat them up. Always use glass, earthenware, 

 agate, or wooden vessels. 



25. Never lose an opportunity to caution persons 

 about the danger attending the inhalation of this gas. 



