Another student was Sartorius von Walterhausen who was one year younger than Listing. Walterhausen, who was interested in geology, became a lifelong friend of Listing.
Ibang mag-aaral ay Sartorius von Walterhausen na isang taon na mas bata sa Listing. Walterhausen, na noon ay interesado sa heolohiya, ay naging isang habambuhay kaibigan ng mga Listing.