‎In this paper we study Finsler metrics with orthogonal invariance‎. ‎We‎ ‎find a partial differential equation equivalent to these metrics being locally projectively flat‎. ‎Some applications are given‎. ‎In particular‎, ‎we give an explicit construction of a new locally projectively flat Finsler metric of vanishing flag curvature which differs from the Finsler metric given by Berwald in 1929.

published in the Calcutta Medical Journal, February 1929. The following case of pygonagous twins was brought to my notice in January 1929. Ganga Bai and Gaura Bai were born in Madras and had attained the age of 20 years. Owing to the conservatism of the parents and the guardians of the twins no medical man had as yet had the opportunity of examining them or taking an X-ray picture of the case. ...

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