31 



LECTUEE II. 



GRAVITATION. COHESION. 



Do me the favour to pay me as much attention 

 as you did at our last meeting, and I shall not 

 repent of that which I have proposed to under- 

 take. It will be impossible for us to consider 

 the Laws of Nature, and what they effect, 

 unless we now and then give our sole attention, 

 so as to obtain a clear idea upon the subject. 

 Give me now that attention, and then I trust 

 we shall not part without your knowing some- 

 thing about those Laws, and the manner in 

 which they act. You recollect, upon the last 

 occasion, I explained that all bodies attracted 

 each other, and that this power we called gravi- 

 tation. I told you that when we brought these 

 two bodies [two equal-sized ivory balls sus- 

 pended by threads] near together, they attracted 

 each other, and that we might suppose that the 



