In the following items, each passage consists of six sentences. The first sentence (S1) and the final sentence (S6) are given. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. 

S1: Isaac possessed a wonderful faculty of acquiring .knowledge by the simplest means. 
P: Yet nothing could be more simple.  
Q: You will never guess how the boy could compel that unseen wonder,-the wind to tell him the measure of its strength. 
R: For instance, what methods do you suppose he took to find out the strength of the wind? 
S: He jumped against the wind and by the length of the jump, he could calculate the force of the wind. 
S6: Thus, even in his boyish sports, he was continually searching out the secrets of philosophy.