BULLETIN 951, TJ. S. DEPABTMENT OF AGRICULTUEE. 



proportion of one part Portland cement to two parts of clean, sharp 

 sand, and it was rough scratched. After this coat had thoroughl}- 



dried, the second 

 ^ coat, approxi- 

 I mately one-fourth 

 a inch in thiclaiess 

 •5 and mixed -in the 

 I proportion of one 

 '^ part of Portland 

 ° cement to one and 

 g one-half parts of 

 M clean, sharp sand, 

 J was applied and 

 -M brought to a float 

 g finish. 



Shelves.— Shelves 

 S were originally con- 

 % structed (fig. 2) of 

 .9 1-inch galvanized- 



1 metal pipe, covered 

 ^ with galvanized- 

 S wire mesh made of 



No. 16 wire with 

 four meshes to the 

 inch. The wire 

 h" mesh was securely 

 soldered to the pipe 

 frame, care being 

 taken to leave no 

 projections that 

 ■| might cut' or scratch 

 I those working in 

 § the compartment. 

 •B It was found, how- 

 ^ ever, that the wire- 

 I mesh covering of- 

 1 fered more or less 

 resistance to plac- 

 ing the trays on 

 ^ the shelves, and it 

 •g was subsequently 



1 removed and the 

 a trays containing 

 S the flasks are now 

 ci placed directly on 



2 the pipes. All the 

 ^ trays containing the 



