THE SEQUOIA 



Columbus' discovery of America (1492) was followed by 

 Magellan's famous trip around the world to the westward (1519 

 1522), during which he discovered the Philippines; and about 

 the same time Cortez conquered Mexico. The New World was 

 - n explored for its reputed hidden treasures, and astronomers' 



rch of the heavens for an orderly movement of planetary 

 bodies resulted in the elaboration of the system of Copernicus 

 (154; . Keppler announced his laws of planetary motion at 

 about the same time (1609), and in the latter part of the seven- 

 teenth century Newton enunciated the law of gravitation. The 

 increasing freedom of thought was expressed in the American and 

 French Revolutions. 



The rapid course of invention during the nineteenth century 

 is too familiar to require detailed mention. The period of the 

 tree's growth, however, is represented by only a few inches in its 

 total diameter. 



The cards representing the growth of biology are arranged in 

 two groups. Those above the line of black cards represent the 

 change of thought in the philosophy of biology, while those below 

 the line indicate some of the great discoveries which have made 

 the science what it is to-day. The latter have been divided into 

 three rows, the uppermost representing General Zoology, the 

 middle Comparative Anatomy and Palaeontology, and the Lov 

 series the evolution of Embryology. 



Very strikingly is it shown that not only the scientific 



all branches of biology, but also the philosophical or speculative 



en developed during the old age- of the tree, or during 



the last }00 years. In fact, modern zoology and inductive 



methods may be said to have begun with William Harvey in the 



ntury. 



It is true that when the ttf n its life, men had ideas and 



con< of the principles underlying nature, but 1 



I on mere hearsay or tradi- 

 tion, and differing but little from tl ing 

 of the Christian 1 



my had been a' \dstill since the 



tim- LD. 1 ^01. This brilliant an 



'3 



