82 EXPERIMENTAL GENERAL SCIENCE 



38. Explain why it is customary to place a piece of wire gauze under 

 beakers, florence flasks, and the like, when heating them over a bunsen 

 burner. 



39. Why does a blanket smother a fire? 



40. For putting out a fire in oil, which is better, water or sand? Why ' 



41. Would flour be of use in putting out an oil fire? 



