IOWA. 109 



The experimental work of the dairy department deah with mois- 

 ture in butter, use of starters in butter makintr, and fjeneral errors 

 in samplin<j and testinnf. Bulletins on moisture content of butter 

 and the use of starters in butter makinjj: were published during the 

 year. 



The entomoloofist completed the study of the life history and treat- 

 ment of the lesser apple leaf folder {Peronea mimita), and published 

 a i)ulletin on the subject. Work was continued on the oyster-shell 

 scale and the apple leaf hopper, and attention was also given to the 

 methods of spraying for the codling moth. 



In agricultural engineering studies relating to the construction of 

 concrete silos were continued. Engine tests with denatured alcohol 

 were made and trials of grain grading and cleaning machinery, 

 Avindmills. and other machinery were conducted. A bulletin on mod- 

 ern silo construction was published during the year. The experi- 

 ments in sewage irrigation in cooperation with this Office underwent 

 further development. 



As already mentioned, the Iowa Station cooperates with this De- 

 partment in work on sewage irrigation, plant breeding, preservation 

 and treatment of farm timber supplies, and with county farms and 

 j:)r()niinent farmers in studying the soil types of the State, together 

 with methods of maintaining their fertility. The extension depart- 

 ment of the college was maintained by a state appropriation of 

 $82,000. This work is carried on by a corps of 21 instructors, 14 

 devoting their entire time and the rest five or six months during the 

 winter season to this distribution of practical information to the 

 farmers. The members of the experiment station staff do not devote 

 any time to extension work. 



The publications received from the station during the year were as 

 follows: Bulletins 07. Methods of determining the moisture content 

 of butter: 98, Clover growing in the loess and till soils of southern 

 Iowa; 01), Results of seed investigation for 1907 (with popular edi- 

 tion) : 100, Modern silo construction; 101, A study of moisture in 

 butter: 102. The lesser apple leaf-folder; 103, The use of starters 

 in butter iniikiiig: liicnnial Reports for 1902-3 and 1904-5; and the 

 Annual Report for 1906. 



The income of the station for the past fiscal year was as follows: 



T'iiite<l states appropriation, Hatch Act $15,000.00 



T'nited States iipprupriation, Adams Act n.(^»0. 00 



State appr<jprialioii 2;"), UUU. 0(J 



lialance troni previous j-ear, state approijriation 2, 421. 1)1 



Farm products 10, 224. 56 



Miscellaneous 511. GO 



'p 



Total U4, 15S. 07 



