VI. Diphtheria and Influenza—Crossed Eyes

Of course, this is a joke. But it is like this when theory is put in the place of true practice. Practice means learning to judge each case on an individual basis. The moment a question is raised concerning the connection between double vision, which is always a form of crossed eyes, and the flu, attention must be drawn to how, on the one hand, a form of double vision is caused by flu, which is a kind of brain ailment and, on the other, how the brain ailment can come about when a person is cross-eyed and the problem is so deeply rooted that left and right do not fit together.