SCIENCE AT TIIE BEGINNING OF THE CENTURY 



do not occur in the lungs themselves, but in the ultimate 

 tissues. Indeed, the matter \vas not clearly settled at 

 the close of the century. Nevertheless, the problem of 

 respiration had been solved in its essentials. Moreover, 

 the vastly important fact had been established that a 

 process essentially identical with respiration is necessary 

 to the existence not only of all creatures supplied with 

 lungs, but to fishes, insects, and even vegetables in 

 short, to every kind of living organism. 



EDWARD JENKER 

 From the painting by Sir Thomas Lawrence 



