66 EGGS IN COLD STORAGE. 



storage room. We will now give our attention to 

 another kind of ventilation, that is applicable when 

 the air without is at about the same temperature as 

 the storage room, or at some degree lower. This 

 will be designated as cold weather ventilation, as this 

 term seems to express its function perfectly. 

 Si a dstora C e in -^ ^as ^ on S been a well understood fact that eggs 

 cooi weather. an( j other products held at about the same or a higher 

 temperature take more harm in cold storage during 

 the cool or cold weather of fall and winter than during 

 a long- carry throug-h the heated term. Much has 

 been said and written about why the old style over- 

 head ice cold storag-es g"ive such poor results during 

 fall and winter, the reason assig-ned being- lack of 

 circulation, as the meltag-e of ice ceases when the 

 cool weather comes. This is true; further, the large 

 body of ice becomes an evaporating- surface, and the 

 dirt and impurities which are found in all natural ice, 

 to a greater or less extent, have accumulated on the 

 top of this ice, and the evaporation which takes place 

 carries gases from this miscellaneous matter into the 

 air of the storage room, with consequent bad results. 

 In some houses this may be avoided by closing the 

 trap doors covering circulation flues, but it is seldom 

 done, and in many houses it is impossible. 

 Pipe cooled Now are we who cool our storage rooms with brine 



rooms in . . 



cold weather. O r ammonia pipes very much better off in this one re- 

 spect than those who have these much despised over- 

 head ice cold storages? Our rooms are cooled by 

 frozen surfaces, on which accumulates the evaporation 

 from the goods in store, which, as we have already 

 plainly seen, contains much foul matter and impurities. 

 Precisely as in the ice cold storages, the cooling sur- 

 faces, which absorb moisture during warm weather, 

 become evaporating surfaces, and give back to the air 

 of the room a considerable portion of the various im- 

 purities and germs which have been accumulated dur- 

 ing the warm weather of summer. To make this point 



