362 



VETEEINAEY HYGIENE 



There is a surface-drain made of iron and roughened to 

 give a foothold (Fig. 146), but it is not clear what advan- 

 tages it possesses over one of brickwork. There is also a 

 modified form of surface drainage such as is seen at 



Fig. 147, where the drains are iron throughout and possess 

 perforated iron movable covers which hide their contents, 

 but do not hinder the entry of urine. The movable cover 

 admits of ready access for the purpose of cleaning out. 



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