AGRICULTURAL ENUINKEiaNG. 1095 



with this HubstaiK-e the author found that Iho (hsiulVctinji jMiwer of formaUn was 

 considerably (hniinished in rooms filled with an unuf<ually moist atniosiihere. The 

 most effective action of forinalin in tiie destruction of tubercle bacillus was obtained 

 when from 0.5 to 1 })er cent (if formic acid was added. 



Experiments with Itrol and Actol, Fkanz (Monalsh. Prakt. Thkrli., 12 {1901), 

 No. 2-3, pp. 104-107). — The author obtained ^ood results from the use of Itrol in 

 cases of fistula, dermatitis, and long-standing wounds. It was found that Actol 

 could be used in intravenous injections in cases where the (colloidal silver prepara- 

 tion had been used ^\■ith good results. 



AGRICULTURAL ENGINEERING. 



Wcter measitrements, B. C. Buffum ( Wyoming Sta. Bpt. 1900^ 

 P2>. 10). — Tlie lueasuremeiits of the duty of water in irrigation given 

 in thi.s article are tlie same as those reported in Bulletin 81 of this Office, 

 (E. S. R., 12, p. 21)5), with the addition of observations during 1899 on 

 the amount of water necessary to produce a maximum crop, and the 

 results of tests of two subirrigation systems at the station. The 

 results of the experiments on the amount of water necessary to pro- 

 duce a maximtmi crop were inconclusive, since the largest amount of 

 water applied was apparently insufficient to produce this result. 

 "Sod land required more w^ater than was necessary on older cultivated 

 soil, and the largest amount of water applied was not excessive." 



Two sj^stems of subirrigation have been under observation at the 

 station for a number of j^ears. "One of these consists of an iron pipe 

 2 in. in diameter and 900 ft. long, used on the campus for irrigating 

 ti-ees. This pipe has given very satisfactory results, but it has not 

 been practicable to measure the amount of water used in it. The 

 other system consists of one-half acre on the experiment farm which 

 is underlaid with porous tile. Lines of •! in. tile are placed 18 in. 

 deep and at distances of 20 ft. apart. These lines of pipe join 6 in. 

 mains extending around the plat, which serve as feed and drain pipes." 

 The results obtained in subirrigating wheat in 1899 are . reported. 

 The results of these experiments and of the general experience of the 

 station with subirrigation ""do not indicate that extraordinary crops 

 are produced by this method of applying water, or that it is econom- 

 ical from the standpoint of the amount of water required to produce 

 a (TO)). More water was used on the subirrigated land last season than 

 on any other ))lat on the farm except one small field of alfalfa." 



Experiments in road surfacing, C. H. Pettee {JSfew Ilainpshire 

 Sta. Bui. 77, pp. lJf7-160.) figs. 2). — In continuation of previous work 

 (E. S. R., 9, p. 797) the author made comparative tests during 2 years 

 of various surfacing materials, including gravel of ditferent kinds, 

 sci-eened and unscreened, clay, sand, point rock, and stones 2 to 6 in. 

 through, applied during the spring of 1898. The difference between 



