84 



GEORGE B. RIGG 



In the spring of 1911 Dr. Frank K. Cameron in charge of the fer- 

 tilizer investigation in the Unites Stated Bureau of Soils wrote 

 to Director Kincaid requesting the cooperation of the station in 

 procuring the facts about the ecology and distribution of the kelps 

 of the Puget Sound region. The writer undertook the work and 

 spent a large part of the summer in making observations on the 

 kelp beds and preparing dried material to be forwarded to the 

 Bureau of Soils for analysis. He was assisted in this work by S. 

 M. Zeller a graduate student at the station. 



Fig. 1 Bed of bladder kelp at low tide at Kanaka Bay, San Juan Island, Wash- 

 ington. Photograph by S. M. Zeller. 



The anatomy and development of this species have been dis- 

 cussed by MacMillan, 3 and the literature of the subject fully 

 cited. He calls attention to the presence of sieve tubes, mucilage 

 canals, secretion cells, cortex, central cylinder, a cambial zone, 

 and tegumentary and photosynthetic tissue, and concludes that 

 the degree of differentiation is physiologically equivalent to that 

 in higher plants. During the summer of 1911, Zeller removed the 

 fronds from several Nereocystis plants growing near the laboratory 

 of the Puget Sound Marine Station and in every case the plant 



3 hoc. cit. 



