SACHS ON HALES 83 



and in that character his fame is imperishable. Of the book 

 which I have been using as my text, namely, Vegetable Staticks, 

 Sachs says : " It was the first comprehensive work the world had 

 seen which was devoted to the nutrition of plants and the move- 

 ment of their sap. ...Hales had the art of making plants reveal 

 themselves. By experiments carefully planned and cunningly 

 carried out he forced them to betray the energies hidden in 

 their apparently inactive bodies 1 ." These words, spoken by a 

 great physiologist of our day, form a fitting tribute to one who 

 is justly described as the father of physiology. 



1 Geschichte d. Botanik, p. 515 (free translation). 



6 2 



