Practitioners in the Victorian Era. A person who practiced medicine in the Victorian era did not always possess a degree from a university. There were doctors with formal educations tending to patients as well as apothecaries freely dispensing medical advice. Furthermore, homemade remedies passed between neighbors.
Martin Luther King Jr. envisaged a time when black and white Americans would no longer be segregated by race. To envisage is to imagine something that does not yet exist. The words envisage and envision share the same Latin root meaning to see. Both words are very similar in meaning but do have slight shades of difference. If you envision something happening, you can see it happening in your mind. I'm sure you can envision yourself graduating from high school!
We could envisage what might be called the sequences; I mean relations between antecedent and consequent. The Foundations of Science: Science and Hypothesis, The Value of Science, Science and Method Henri Poincar. Our minds, too, are not different in the Object which they envisage.