33 8 Twelfth Annual Report. 



SCIENTIFIC. 



Parallel with the economic work of the Station, considerable 

 investigation of a purely scientific nature has been conducted. 

 However, it is very difficult to state at this time how much econ- 

 omic bearing apparently pure scientific truths may have in the 



future. 



A collection of about 400 plants bought by the University 

 sometime ago has been mounted and distributed in the herb- 

 arium together with some 300 sheets which were previously 

 mounted. The working capacity of the herbarium has therefore 

 been increased by about 700 sheets. 



During the past favorable season a special effort has been 

 made to secure specimens of the local flora. Since the first of 

 September about 1200 numbers of plants (1500-2700) have been 

 collected. Tbese are, of course, to some extent duplicates of 

 plants already in the herbarium, but even so they are very valu- 

 able in studying variation, distribution, etc. The grasses from 

 these collections have been sent to Professor F. Lamson-Scrib- 

 ner, U. S. Department of Agriculture, who has recently published 

 a pamphlet containing the results of his determinations. The 

 collection he reports to be a large one for the time employed in 

 its gathering. It contains about a half dozen species new to 



science. 



The writer has published one paper* in which a new species 

 of ergot collected on galleta grass at Cochise was described. This 

 may be of some economic importance, for it is well known that 

 the closely related common ergot of the wheat grasses is very in- 

 jurious to cattle in some of the prairie states. 



David Griffiths, 



Botanist. 



*Bull. Torr. Bot. Club, 28: April 1901. 



