July, 1923 
71 
The cold pack preserver is 
equipped with wire racks in 
which the jars or bottles are 
placed. Equipment of this 
size lessens the labor of can¬ 
ning for a large-sized family 
ing of every tool and container, 
scale and hand. 
Since many bacteria live with¬ 
out air we have to add the element 
of heat to kill as many more as 
we can. 
Sterilizing is merely the process 
of killing or preventing the ap¬ 
pearance of meddlesome bacteria. 
Absolute sterilization is difficult 
to accomplish, because these bac- 
The pressure cooker depicted 
at the left, is one of the most 
efficient additions to modern 
canning. In addition one 
should have a good kettle, 
measure, and straining rack 
teria form spores (highly resis¬ 
tant bodies) which defy all man¬ 
ner of onslaughts against them. 
The trouble is that some of these 
spores can resist boiling for even 
as long as 38 hours or so. How¬ 
ever most of these spores “give 
up” and so we are pretty safe 
after all. 
Many of the spores cannot live 
{Continued on page 94) 
Bradley & Merrill 
Either enamel or aluminum ware is advisable for canning, because both can be thoroughly 
cleaned and sterilized. The set of enamel equipment shown here represents the necessary pieces. 
The scales are especially useful, the wide-mouthed jar funnel should prove a convenience 
