When you see any decaying matter you may

When you see any decaying matter you may

When you see any decaying matter you may

When you see any decaying matter you may know that in it minute plants much like the yeast plant are at work. Since decay is due to them, we take advantage of the fact that they cannot grow in strong brine or smoke; and we prepare meat for keeping by salting it or by smoking it or by both of these methods.

Fig. 118. Forms of Bacteria
a, grippe;
b, bubonic plague;
c, diphtheria;
d, tuberculosis;
e, typhoid fever