ERRATA. VOL. II. 



Pfcge 3, line 5, read I. p. 25 instead of xxxi. p. 30. 

 73, 14, 60 76. 



188, 27, p. (181) p. (189). 



cPF 

 91> " b ' " p ~~ p dydz " ~ V dxdy' 



201, 10, insert // after the differential operator in equation (18). 





In the Bakerian Lecture at page 18, line 21, the value of - r* is given as 11 12 - 8, where 



] 



r is the radius of each of the movable discs used iu the experiments on Viscosity. But with 

 the value of the diameter as given at page 4, line 14, this number should be 1220-8. The 

 values of the quantity A in the fourth line of the Table given at page 19 should therefore all be 

 increased by 108. The values of Q, the quantity in the fifth line, increase in the same proportion 

 as the values of A. Hence according to equations (23) and (24) the values of /*, the coefficient 

 of Viscosity, will be smaller than they appear in the text and will approximate to those obtained 

 by more recent experiments. The above inaccuracy in the numerical reductions was pointed out by 

 Mr Leahy, Pembroke College, Cambridge. 



