90 EXPERIMENT STATION RECORD. [Vol.40 



The average life of a tractor is estimated to be not longer than 8} seasons 

 from the practical standpoint. Other general data are reported. 



Power farming in Idaho, J. C. Wooley (Idaho Sta. Bui. Ill {1918), pp. 11, 

 figs. 4)- — Data from reports of 127 tractor owners in Idaho on tractor opera- 

 tion are summarized. These indicate that when selected to suit the farm and 

 intelligently and carefully operated the tractor is a profitable Investment in 

 Idaho. To realize this the farmer must he able to make all minor repairs him- 

 self and to get repairs and expert help quickly for larger installations. Depend- 

 ability is considered the largest factor In the success of the tractor. The 3-plow 

 size is favored by a majority of Idaho owners. The reports Indicate that proper 

 care of lubrication will prolong the life of the tractor and that the best quality 

 of oil is the cheapest. The tractor motor should pull its rated load the greater 

 portion of the time, but overloading causes trouble. Taking off a plow may 

 enable the tractor to operate at it< rated speed and ba< n's accom- 



plishment. 



The tractor that displaces half its value in horses La considered a profitable 

 investment In Idaho. 



Getting rid of the stumps ( WitOOtuin Sta. liul. ::■', | /. | -. J0). — 



This is a compilation of data by l". M. White and B. it. Jones fn - b] 0. 



Livingston, L. F. Livingston, a. Mathewson, and J. Hussey on stump removal 

 practice in Wisconsin. 



The stump puller and dynamite used t< gether are considered I tie most 



successful and economical results In Wisconsin. It is noted that In blast 

 stumps it is rarely necessary to use a dynamite of higher grade than 20 per 



With r< e, it is noted that the stump and not the a< re is the 



unit of measure and that the cosl varies with th< kind, number, and condition of 

 tin .. the type of soil, and the BkUl of the workmen. Types of pull< 



and ; 



Public Roads (17. S. Dept. Agr., Public Rood*, l {1918), No. ). 



I. — This number presents several articles and notes dealing with \ 

 phases of road construction and maintenance, Including the following : The Loca- 

 tion and Building of Roads In the Nations \ v.. Loder, and War 

 Brings Bridge Building Back to Early Practices, by O. L Grover. 



The use of lumber on California farms. M. B. PKATT [Calij Sta, Bui. 



(0).— This bulletin gives popular Information re- 

 garding the properties of different woods available In < California and the relation 

 Of these properties to different uses made of lumber on the farm. It is introduc- 

 tory to plans for farm structures ed to meet the demands made for farm 

 buildings in the State. A key for identification of v e ommonly used by 

 lifornla farmers Is Included, together with a list of publications on the 



SUbj. 



The round barn. W. J. PbaSKB (Illinois sta. Circ. 230 {1918), Pfl flffS. 



.—This is a revision of Bulletin 148 of the Btation (E. 8. K.. 23, p. 190). 

 The advantages and disadvantages of the round barn are enumerated and ■ 

 comparison is made of round and rectangular barns based "ii Illinois conditions. 

 It is shown thai a lOO-cow rectangular ham requires one-fourth to over one- 

 half greater expenditure for lumber than la required by a comparable round 

 barn and that there is a saving in the necessary carpenter work In favor of 

 the round barn. 



General data on the arrangement and construction of round barns • 

 given. 



