Arctic and Antarctic Exploration Including the Contributions of Physicians and Effects of Disease in the Polar Regions

To the Editor: I read with great interest the fascinating article by Fodstad et al. (1). I also appreciate that the editor had the courage to publish such a “non-neurosurgical” article in a neurosurgical journal. The article provides a nice relief in our clinical and scientific routine. However, there is an error. Lemons and oranges contain about 50 mg of ascorbic acid per 100 g of fruit, not per 100 mg of fruit. To my knowledge, hip (500–1700 mg/100 g) and sallow thorn (200–900 mg/100 g) contain the highest amounts of vitamin C. In animals, the suprarenal gland is especially rich in ascorbic acid, up to 500 mg/100 g. Henry W. S. Schroeder