HOW THIS BOOK CAME TO BE WRITTEN 7 



for an occasional hour or day, it is most urgent that we 

 should know something of the machine which has to carry 

 us day after day along the rough but joyous journey of 

 life, a journey which we can enjoy only if the machine 

 runs smoothly right to the end. Then, whether we will 

 or no, death will come and dismount us. This is the 

 machine we are now setting out to examine. 



