424 QUESTIONS ON 



816. When can the brain superintend only the involuntary opera 

 tions ? 



817. Explain this by the musician. 



818. In what conditions can the mind be concentrated on a subject? 



819. What faults in many school-rooms interrupt study? 



820. What further faults are mentioned ? 



821. Why is fatigue incompatible with mental labor? 



CHAPTER IX. 



822. 823. How do moral feelings affect mental attention ? 



824. What illustration does the school-room furnish? 825. What 

 Other illustrations ? 



826. What seeming exceptions are mentioned ? 



827. How are they reconciled with the general principle ? 



828. What do these disturbing influences require ? 



829. What motives for study may interrupt it ? 830. Illustrate. 



831. What motives aid the mind in fixing attention on a subject? 



CHAPTER X. 



832. What differences exist in the various faculties of the same per- 

 son? Of different persons? What is the cause of this difference ? 



833. How are the mental and moral powers strengthened ? What 

 is the purpose of education ? In what order do the powers appear? 



834. How is the child prepared for abstruse subjects ? 



835. What are some characteristics of childhood ? 



836. Can the mind be prematurely strengthened ? 



837. What is the effect of premature mental exertion ? 



838. What dependence among the organs ? Illustrate. 



839. Why does the health of students often fail ? 



840. Is mental effort compatible with health and long life? 



CHAPTER XI. 



841. Are the several systems equally strong in the same person ? 

 How can this diversity be remedied? 



842. How can mental irregularities be remedied? What is often 

 done at variance with the proper remedy? 



843. What will be the state of the faculties which are exercised ? 

 What of those not exercised ? 



844. What illustration is drawn from the mechanic arts? 



845. What is the effect of exclusive cultivation of some of the intel- 

 lectual powers ? 



846. Does the same principle apply to the moral powers ? Illustrate. 



847. What facts show that any faculty can be strengthened at any 

 time of life ? 



848. How does constant use affect the power of observation ? 



849. Show how the same principle applies to the moral powers. 



850. What part of this work belongs to teaching? What part to 

 practice ? 



851. How can true politeness be distinguished from the assumed? 



