Dr. David Pearce Penhallow 389 



In determining the species of fossil plants, reliance 

 must be placed largely upon the structure of the wood 

 and comparisons with the stems of modern types must be 

 instituted. Dr. Penhallow, therefore, spent several 

 years in a study of the conifers. The results are em- 

 bodied in a book entitled "North American Gymno- 

 sperms. " The first part consists of a discussion of the 

 minute anatomy of the stem and of the probable origin 

 of the constituent elements. The second part is a 

 manual by means of which a species may be determined 

 through the microscopic examination of its wood. This 

 useful work was to have been followed by a similar study 

 of the Angiosperms, but only a paper upon the willows 

 was completed. 



History, whether written upon the rocks or in for- 

 gotten volumes, was particularly attractive to Dr. Pen- 

 hallow. His gleanings in the latter field are gathered 

 in several articles. The most interesting and valuable 

 comprise a complete "Review of Canadian Botany," 

 from the time of the first settlement in New France 

 until 1895. 



Dr. Penhallow 's power of administration was utilized 

 not only within but without the University. The last 

 years of his life were largely devoted to the organization 

 of the new Marine Biological Station at St. Andrew's, 

 New Brunswick. He was a trustee of the Marine Bio- 

 logical Laboratory, Wood's Holl, Mass.; Chairman of 

 the American Biological Research Stations ; Chairman, 

 from 1902 to 1904, of the British Association's Com- 

 mittee on the Ethnological Survey of Canada ; President 

 of the Society of Plant Morphology and Physiology in 

 1899 ; Vice-President of the section of Botany at the 

 meeting of the British Association in 1897; Fellow of 

 the Royal Society of Canada and President of Section 

 IV from 1896 to 1897 ; and President for several years 

 of the Montreal Natural History Society. In addition, 

 he was a member of many other organizations, including 

 the Royal Microscopical Society of London, the Botani- 



