146 



The second talk was given by Dr. Edwin Matzke who spoke on 

 The Microscopic Anatomy in the Identification of the Commercial 

 White Pines. This was illustrated with slides and specimens. The 

 speaker's abstract follows : 



There are three common commercial species of white pine growing in the 

 the United States : the northern white pine, Piniis Strohiis, the western or 

 Idaho white pine, P. monticola and the sugar pine, P. Lamhertiana. In gen- 

 eral these trees are similar ; the northern pine is distinguished from the others 

 by its finer needles, while the sugar pine can be told by its long cones. 



The wood of these three species is also much alike in its gross as well as 

 in its microscopic characters. The texture is somewhat coarser in the sugar 

 pine, and the resin ducts are larger and darker in color. Sugar pine also has 

 the largest tracheids, northern white pine the smallest. 



The most diagnostic microscopic difference between these three species 

 is the shape of the pits of the ray parenchyma cells. They are large and 

 oblong in P. Strobtis, small, diagonally elongated and often apiculate or 

 lemon-shaped in P. Lambcrtiana, and intermediate between these two types 

 in P. monticola. 



In many ways, microscopically as well as macroscopically, the western 

 white pine is intermediate between the other two. This is also true of its 

 distribution. However, other species also undoutbedly enter into this series. 



The meeting was adjourned at 4.35 p.m. to be followed by a tea 

 served by friends at the Garden. 



Respectfully submitted, 



Honor M. Hollinghurst 

 Recording Secret.\ry 



Minutes of the Meeting of May 5, 1942 



The meeting was called to order at 8.20 p.m. by the second vice- 

 president, Dr. Chandler, at Schermerhorn Hall, Columbia Uni- 

 versity. Forty members and friends were present. 



The minutes of the preceding meeting were accepted as read. 



The following were elected unanimously to annual member- 

 ship : 



Dr. V. E. Brown, Taylor University, Upland, Indiana 



Dr. Wayne Manning, 14 Adare Place, Northampton, Mass. 



Dr. Ernest Ball, Osborn Botanical Laboratory, New Haven, Conn. 



The resignations of the following were accepted with regrei . 



Dr. D. A. McLarty, Dartmouth College, Hanover, N. H. 

 Dr. George C. Wood, 4430 Tibbet Avenue, Riverdale, N. Y. 

 Dr. Walter T. Bedell, West Winding, Poughkeepsie, N. Y. 



