vi PREFACE 



work during the last five years. They are in continuation of a 

 First Series of Lectures on " Animal Electricity," published in 

 1897. They will no doubt be found to suffer from many of the 

 disadvantages inherent to the nascent state, I hope that they 

 may prove to possess also some of its advantages. 



A. D. W. 



October 1903. 



