INTRODUCTION 3 
Hydrophytologie Danicce was published in 1819 and 
dedicated to “ Frederic VI., King of Denmark, and 
of the Goths and Vandals.” Just as Linneus 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 
Linnzeus in the spirit of Linnzeus 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 Algz, 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. : 
Ba 
