Portrait of Sir Henry Dale, with members of the staff, Wellcome Physiological Research Laboratories.

Front row (left to right): G.H.J MacAllister, G. Barger, Henry Dale, R.A. O'Brien, H.J. Sudmerson. Back row: G.S. Walpole, A.T. Glenny, J.H. Burn, J.B. Buxton, A.J. Ewins.