17. Although we have a great deal of evidence of Challenger's wide scientific knowledge, particularly in Zoology, in which other area does he hold a qualification?
From Quiz Professor Challenger
In "The Poison Belt" Challenger sends invitation cards to a number of people to witness a great scientific experiment. Characteristically, the cards are headed:
"Professor G. E. Challenger, F.R.S., M.D., D.Sc., etc. (late President Zoological Institute and holder of so many honorary degrees and appointments that they overtax the capacity of this card)"
Nowhere are we told that he was a professor of zoology, but internal evidence (including the above) point strongly to this. The fact that he was a Fellow of the Royal Society and held the degree of D.Sc. (Doctor of Science, which in Britain is a higher doctorate than the more usual Ph.D.) indicates professional eminence. M.D. ("Medicinae Doctor"), on the other hand, is a medical qualification.