REPORT OF EXHCUTIVE COMMITTEE. II3 



Henry S. Washington, Locust, N. J. Grant No. 95. For the 



chemical investigatio7i of igneotis rocks. $1,200. 



Abstract of Report. — The main objects of investigation were the 

 leucite-bearing rocks of Italy, of which few satisfactory analyses 

 exist. About twenty-five complete analyses were made by Dr. 

 Washington in his own laboratory. The analyzed specimens were 

 selected as representative of the various rock types which occur at 

 each of the different centers of eruption, so that not only do the 

 analyses express the range in composition of the different rocks, but 

 the special features of each center, as well as the general characters 

 of the Italian petrographical province. The rocks were found to 

 fall into nine subranges, four of which are new. A special study 

 was made of the types and habits, of which at least nine are well- 

 defined and established. The constant presence of barium is a note- 

 worthy feature, and is correlated with the high potash. Analyses 

 were also made of some rocks from other localities of especial inter- 

 est. The investigations, which are not quite complete, will be em- 

 bodied in a monograph and one or two shorter papers, which it is 

 hoped to complete by the end of the year. Only a small portion of 

 the grant was used, as Dr. Washington was unable to go abroad to 

 make special collections. 



ENGINEERING. 



W. F. Durand, Stanford University, California. Grant No. 64. 



For experimeyits on ship resistance aiid propulsion. (For first 



report, see Year Book No. 2, p. xxxii.) $4,120. 



Abstract of Report. — The number of runs thus far made is 2,121, 



of which 1,216 belong to last season's work and 905 to the present 



season. These figures are, furthermore, exclusive of 228 runs made 



on a special model representing an annular element of a propeller 



blade. The work yet remaining will comprise the following items : 



( 1 ) About two hundred runs on regular propellers. 



(2) About two hundred runs on a special model representing an 

 element of an ideal propeller blade. 



(3) The reduction of the observations made this season, and the 

 final review of the entire series, with analysis of results in such ways 

 as shall seem most useful for the purposes in view. 



The accomplishment of these items will complete the investiga- 

 tion as originally laid out, covering the examination of 49 model 

 propellers, and of two special models intended to elucidate certain 

 points in connection with special phenomena encountered during the 

 progress of the work. 



