Induction is usually defined as the establishment of the material truth of a general real proposition

Induction is usually defined as the establishment of the material truth of a general real proposition.

Hence purely formal grounds cannot be enough for the establishment of the inductive conclusions.

The material truth is assured by material grounds. For the material truth the particular instances are taken into consideration through observations or experiments. Thus observation and experiment are the material grounds of induction.

In order to arrive at a conclusion like “All crows are black”, it is very much required to observe the colour of some particular instances of crows. Similarly, in order to arrive at a generalized conclusion like “Water is composed of hydrogen and oxygen”, one has to check its composition through the experiment of the electro-chemical analysis of water.

It has been said that each premise of the inductive reasoning stands for one particular instance that is expressed by the help of one true proposition.

Those true propositions become the basis for the conclusion. Those true propositions are usually obtained through observation or experiment. In this way observation and experiment supply the materials of inductive reasoning.