This comparative approach may lead to the identification of the peculiar structures or properties that permit the tubercle bacilli to establish themselves, multiply and cause damage in the tissues of the body.
Some people suggest catching and using plankton.
It is not an attractive food, but it is nutritious, and special processing might make it acceptable. But filtering out a sizable quantity of such small creatures would require an enormous output of energy. By and large we must leave the plankton to the fishes. The canal was planned as a radical method of solving the problem of sewage disposal for the city of Chicago. The plan involved cutting a great canal thirty-five miles in length and turning the sewage of the city into this vast drainage ditch.