caption: The image shows a black and white photo of a man with a beard wearing a black dress. At the bottom of the image, there is some text which reads "Portrait of Dr. J. S. Jourdain". The man in the photo has a serious expression on his face and his eyes are focused intently on something in the distance. His hair is neatly combed and his beard is full and well-groomed. He has a strong jawline and a prominent nose. His posture is upright and his hands are clasped in front of him.