CONTENTS 



THE NEWEST IDEAS AS TO WHAT IS LIFE 



Recent investigations which seem to show that life is a 

 form of fermentation The r61e of the ferments or en- 

 zymes in the bodily functions The possibility of revers- 

 ing the life-processes, and growing backward . Page 229 



HOW THE BRAIN THINKS 



The chemistry and structure of the brain, and how recent 

 discoveries are being applied to an explanation of the 

 physical process of thought Page 251 



THE WAY THE HUMAN BODY FIGHTS DISEASE 



The discovery of the serums or anti-toxins, by Pasteur 

 and his pupils Metchnikoff's theory of the devouring- 

 cells, and their battles with the microbes The new chem- 

 ical theories of Ehrlich Page 273 



THE SPIRIT -RAPPERS, THE TELEPATHS, AND 

 THE GALVANOMETER 



The light that modern science may throw on psychic 

 problems A description of marvellous new instruments 

 of measurement, which are thousands or millions of times 

 more sensitive than our primal senses The argument 

 that might be drawn from some of their perform- 

 ances Page 291 



WIRELESS TELEGRAPHY 



The discoveries which made it possible, and a descrip- 

 tion of the apparatus used Signor Marconi not its in- 

 ventor Page 311 



ix 



