It is, I find, in zoology as it is in botany: all nature is so full, that that district produces the greatest variety which is the most examined.
The grounding in natural sciences which I obtained in the course of my medical studies, including preliminary examinations in botany, zoology, physics, and chemistry, was to become decisive in determining the trend of my literary work.
After the first exams, I switched to the Faculty of Philosophy and studied Zoology in Munich and Vienna.