EXPERIMENT STATION BULLETINS. 



249 



The materials, gravelly saud and cement, were mixed in the propor- 

 tions 5 to 1, in the usual way, excepting that the mixture was, perhaps, 

 ^vetter than usual. 



Upon the completion of the wall a 14 i^'^ch coat of plaster was applied 

 to the inside. This plaster was made of sifted sand and cement in the 

 proportions of two to one. 



Fig. 13. Scaffolding and forms used in the construction of the Porter 

 silo (Fig. 8) just before the completion of the silo wall. 



This silo, built in the fall of 1907, has been filled twice and Mr. 

 Porter is well pleased Avith the quality of the ensilage. Samples taken 

 from the edge, center, and mid-way between center and wall and sent 

 to the college were of good quality. 



