INTRODUCTION 3 



Hydrophytologicc Daniccc was published in 1819 and 

 dedicated to " Frederic VI., King of Denmark, and 

 of the Goths and Vandals." Just as Linnaeus was 

 the last of the older naturalists as well as the first of 

 the new, so the elder Agardh makes a link for us 

 in the history of Phycology. With his greater son, 

 happily still alive, he laid the foundations of the 

 present system of classifying seaweeds, while their 

 fellow-countryman Fries was performing a like 

 service for the study of Fungi, continuing the work of 

 Linnaeus in the spirit of Linnseus and in the land of 

 the great naturalist. Germany contributed Kiitzing 

 to the group of great systematic writers of the same 

 period, and though his work is characterised more by 

 his extraordinary industry than by any new departure 

 of system or method, it has greatly influenced the 

 study by increasing the sum of knowledge and the 

 facilities of reference. Our countrymen Harvey 

 and Greville achieved yet greater advances. The 

 former, by his travels and his genius as a collector, 

 describer, and depictor of marine Algae, surpassed all 

 others in this field ; while the latter, in addition to 

 his great services to other departments of crypto- 

 gamic botany, has left observations of the minute 

 structure of seaweeds that no subsequent research 

 has shaken, and has done much towards establishing 

 a natural system of classification. Thuret, and his 

 fellow-worker Bornet, brought to its present state of 

 development the methods of minute study of 

 structure and development that only need wider ap- 

 plication in the future to ensure the advancement 

 of Phycology. 



B 2 



