Food preservation with special reference to tropics.

Food is a major preoccupation of mankind. Thousands of years
ago, our ancestors roamed the wild forests, hunting game and collecting
fruits. Man was a food gatherer in those days, not a producer. As time
passed on, man felt the necessity of storing foods and discovered that dry
foods like seeds, grains and nuts could keep well. It was soon observed
that extra meat could be stored after drying the slices in the sun. The art
of preserving meat by salting and smoking were also chance discoveries of
man.
As human civilization advanced, living became more complex.
People began to live together in cities and move from one type of climate
to another and the problems of food preservation became more difficult.
Human ingenuity steadily overcame the difficulties and new methods of
food preservation soon came into existence.