68 re:ports of inve;stigations and projects. 



Material assistance and advice in various investigations have been received 

 from Prof. R. H. Forbes, director of the Arizona Agricultural Experiment 

 Station, and from Prof. J. J. Thornber, of the same institution; also from 

 Prof. K. C. Babcock, Prof. Cyrus Tolman, Prof. F. N. Guild, and Prof. 

 G. E. P. Smith, of the University of Arizona. 



The members of the staff have been able to furnish aid to numerous 

 workers in several branches of science and to accompany many visiting 

 parties in profitable journeys afield. 



EQUIPMENT. 



The development of the equipment made necessary the design of many new 

 pieces of apparatus, of which the automatic rainmeter by Mr. H. de Raasloff 

 is the most notable. The cup evaporimeter, electric regulator, solar con- 

 denser, field still, and other pieces are to be included in the new forms brought 

 into service. 



A detachable motor has been secured for the boat used in the Salton Sea 

 investigations, and additional equipment for the pack-train and other furnish- 

 ings necessary for field work have been provided. 



The greenhouse forming a portion of the laboratory has been completed, 

 provided with proper shades, benches, and tables and has been fully occupied 

 throughout the year. Roofs have been placed on the stone reservoirs and 

 the pipe lines from the well and various distributing lines have been com- 

 pleted. The engine and pump have been suitably placed on cement bases and 

 shelters built over them. A gasoline machine has been put in place with a 

 capacity of 75 burners and the gas conducted through the laboratories to the 

 proper points. 



A portion of the domain separated from the main body by the road leading 

 to the Laboratory has been fenced, and a fence has been thrown around a 

 small area of alluvial bottom land near by, the use of which is given to the 

 Institution. Upon this has also been erected a structure suitable for shelter- 

 ing six horses and some gardening equipment. 



