It would be impossible to give any exact quantity, as so much depends upon the other ingredients.
Some people use bread-crumbs only in making plum pudding, and no flour, in which case, of course, a very considerable number of eggs must be used or else the pudding will break to pieces.

In the case, however, of oil being used as a substitute for butter, it is of the utmost importance that the oil be pure and fresh.

We here have to overcome a deeply-rooted English prejudice.

Pure oil is absolutely tasteless, and it has often been remarked by high-class authorities that really pure butter ought to be the same.

We fear, however, that purity in food is the exception rather than the rule, as at no period of this country's history has the crime of adulteration been so rampant as in the present day.
Adulteration has been said to be another form of competition.