394 EXPERIMENT STATION RECOED. 



sued by the chemical and agricultural engineering: sections of the station as to 

 the cause of the rapid corrosion of wire fencing. 



Aside from the quality of the fence and the galvanizing, the knot is consid- 

 ered to determine the life of the fence, as it is there that the initial corrosion 

 usually takes place. 



In a discussion of the facts known regarding corrosion, it is stated that (1) 

 corrosion is conmiunicable by contact, new wire being corroded by having rusty 

 iron come in contact with the galvanizing, thus facilitating chemical action ; 

 (2) the first corrosion takes place where a strand is injured and the galvanizing 

 T)roken or chipped; (.3) vertical wires corrode the more rapidly, rust being 

 "washed downward to the uninjured parts; and (4) lower horizontal wires are 

 likely to be free from corrosion as well as those on posts, it is thought, because 

 of the absence of electrolytic action, wood posts, weeds, and grass de-electrifying 

 the wires. 



Stable ventilation, J. H. Grisdale {Canada Expt. Farms Rpts, 1907, pp. 

 J/8-56, figs. 5). — There is given in this report a brief general discussion of prin- 

 ciples to be observed, followed by a description of different systems of ventila- 

 tion which have been tried at the Central ExiJerimental Farm. 



The Rutherford system is reported to be in the most common use because of 

 its simplicity of manipulation and affording the least opportimity of being 

 -wrongly operated. The essential feature of this system is an arrangement by 

 which the fresh air enters at the floor level and leaves through a flue extending 

 from the top of the stnble to the roof. 



A modification of the King system (E. S. R.. 20, p. 989) also proved satis- 

 factory. In this the pipes are all inside the building and the outlet at the 

 ceiling level, making it easy to be installed in buildings already built. 



Experiments were also made in ventilating a stable by covering the windows 

 with muslin. With the outside temperature varying from 30 to 2° F., the inside 

 temperature varied from 62 to 36°. This method was not found to be satis- 

 factory because of the great variation in temperature even with careful watch- 

 fulness, the darkening of the stable making it gloomy and damp, and the fouling 

 of the muslin making it muddy in ai^pearance and unsanitary in condition. 



Muslin curtain ventilation v. Massey system and King^ system, W. H. Day 

 {Ann. Rt)t. Ontario Agr. Col and Expt. Farm, SJf (1908), pp. 58-6-',).— This 

 Investigation was undertaken for thesis work by students of the college. 



In the Massey system, which was already installed in the farm stable, fresh 

 air is admitted at the floor level, while the foul air is drawn from the ceiling. 

 The King system (E. S. R., 20, p. 989) was in use in the dairy stable. In both of 

 these buildings muslin curtains were installed and observations were taken, 

 using each system independently. During the experiments determinations were 

 made of the quantity of carbon dioxid, humidity, temperature, and wind velocity. 

 The results are given in tabular form. 



The r-onclusions arrived at were that the muslin curtain system as compared 

 with either the Massey or King systems is unreliable and inferior. This is in 

 confirmation of the results obtained by Grisdale as noted above. It was shown 

 that with the muslin curtain system irregular distributions of carbon dioxid 

 and of moisture occurred and that more of both were present than with the 

 other systems. 



Plans of farm building's (Jour. Roy. Agr. Soc. England, 69 (1908), pp. 

 241-273, pis. 4)-— A competition was held in 1908 by the Royal Agricultural 

 Society of England for plans of farm buildings suitable for a tenant farmer on 

 a mixed farm of from 300 to 400 acres. The farm was assumed to be half 

 grass and half arable, the grass land being suitable for the production of milk 

 and the arable laud regarded as used for turnips or barley. 



