30 



LECTURE U, 



CONTENTS. 



Description of method. Illustration of Ohm's law. Dead-beat 

 and oscillating magnet. Alcohol, soda water, tobacco 

 smoke. Carbonic acid. The function of respiration. In- 

 tegration and disintegration. Action of carbonic acid in 

 further detail. 



The value of experimental results depends above 

 all upon the method by which they may have been 

 obtained, and the great end of any method is that it 

 shall stringently insulate from amid a crowd of pos- 

 sibilities the particular phenomenon to be qualitatively 

 observed, and if practicable, quantitatively measured. 

 It is of the first importance that the method of inquiry 

 should be precisely given, for that method gives 

 measure of the degree of simplicity and therefore of 

 cogency to which experimental analysis and criticism 

 have been carried. 



And short of this, even for the simple interchange 

 of information, such as students of particular branches 

 of science might desire from each other, it is necessary 

 that the instrumental means by which each expert 

 reads his little bit of natural knowledge should be 

 clearly understood. Each province of knowledge has 



