ical Society), which is on loan from the Academy of Natural Sciences 

 of Philadelphia. The loan of the Elliott Herbarium from Charles- 

 ton Museum makes possible the crosschecking of type specimens 

 in the two collections. With Curator Thieret he prepared two 

 papers (one in press) on the occasion of the centenary of the death 

 of Thomas Nuttall, early North American naturalist. 



Dr. John W. Thieret, Curator of Economic Botany, continued 

 his studies of various tropical American Scrophulariaceae and of 

 temperate and subarctic Gramineae. He published a statistical 

 enumeration of the Scrophulariaceae (see page 104) and prepared 

 some entries of Scrophulariaceae for the international Index Nomi- 

 num Genericorum (Utrecht). Accompanied by Robert J. Reich, 

 Custodian of the Herbarium, he made a field trip to the District 

 of Mackenzie, Northwest Territories, Canada, from June 1 to 

 August 15 (see page 36). Most of the time was spent surveying 

 the vegetation along the new Enterprise-Mackenzie River High- 

 way located on the northern edge of the Alberta plateau southwest 

 of Great Slave Lake. In addition, several days were spent at 

 Lake-on-the-Mountain atop the Horn Plateau west of Great Slave 

 Lake, an area previously unvisited by a botanist. 



Miss Edith M. Vincent, Research Librarian, prepared indices 

 for various volumes of Museum botanical publications, checked all 

 references for the Flora of Peru, and assisted many correspondents 

 by finding and sending to them descriptions of and information 

 about various plants. 



Accessions— Botany 



The largest gifts to the herbarium of vascular plants were 4,809 

 plants of the United States collected by Holly Reed Bennett and 

 1,101 plants of Mexico, Panama, and Venezuela collected by Asso- 

 ciate Curator Smith. Professor P. Maheshwari of the University 

 of Delhi (India) sent an unusual gift of two vials of flowering speci- 

 mens of Lemna paucicostata and Wolffia microscopica. The largest 

 collection of plants acquired through exchange included 433 speci- 

 mens of vascular plants of the Northwest Territories from the 

 Canada Department of Agriculture. An interesting collection of 

 950 vascular plants of South Africa was purchased from H. J. 

 Schlieben of the National Herbarium in Pretoria. The crypto- 

 gamic herbarium received a very good collection of bryophytes of 

 Peary Land as an exchange from the Botanical Museum of the 

 University, Copenhagen. 



54 



