Journal of Non-Newtonian Fluid Mechanics, 40 (1991) 397-398 Elsevier Science Publishers B.V., Amsterdam Contents of Vol. 40 Vol. 40, No. 1 Finite amplitude oscillations of viscoelastic fluids J.S. Vrentas, D.C. Venerus and C.M. Vrentas (University Park, PA, USA) Numericai simulation of hole pressure for a Johnson-Segaliman fluid M. Yao and D.S. Malkus (Madison, WI, USA) Long-wave analysis of viscoelastic film leveling D.W. Bousfield (Orono, ME, USA) Convected coordinates and elongational flow A. Kaye (Manchester, UK) Steady Poiseuille flows for a Giesekus fluid G. Schleiniger and R.J. Weinacht (Newark, DE, USA) Exit and entrance flows of non-Newtonian fluids in parallel slits B.J. Yarusso (Madison, WI, USA) A finitely extensible bead-spring chain model for dilute polymer solutions L.E. Wedgewood, D.N. Ostrov and R.B. Bird (Madison, WI, USA) Short communication On the comparison of simple non-monotonic constitutive equations with data showing slip of well-characterized polybutadienes J.A. Deiber and W.R. Schowalter (Urbana, IL, USA) Book Review Calendar Vol. 40, No. 2 Interfacial instability due to elastic stratification in concentric coextrusion of two viscoelas- tic fluids K. Chen (Potsdam, NY, USA) Orientational transition in radial flow of a nematic liquid A.D. Rey (Montreal, Que., Canada) Observations on the elastic instability in cone-and-plate and parallel-plate flows of a polyisobutylene Boger fluid G.H. McKinley, J.A. Byars, R.A. Brown and R.C. Armstrong (Cambridge, MA, USA) .... 398 Newtonian and non-Newtonian flow in a channel obstructed by an antisymmetric array of cylinders G. Georgiou (Louvain-la-Neuve, Belgium), S. Momani (Aberystwyth, UK), M.J. Crochet (Louvain-la-Neuve, Belgium) and K. Walters (Aberystwyth, UK) Short communication Elastic instability of the interface in Couette flow of viscoelastic liquids K. Chen (Potsdam, NY, USA) Calendar Vol. 40, No. 3 Measurement of extensional viscosity of polymer solutions T. Sridhar, V. Tirtaatmadja and D.A. Nguyen (Clayton, Vic., Australia) and R.K. Gupta (Buffalo, NY, USA) Mechanics of the “‘falling plate” extensional rheometer R.W.G. Shipman and M.M. Denn (Berkeley, CA, USA) and R. Keunings (Louvain-la-Neuve, Belgium) Sausage instability of a thread in a matrix; linear theory for viscoelastic fluids and interface J.F. Palierne and F. Lequeux (Strasbourg, France) The inlet layer in the flow of viscoelastic fluids L.P. Cook and G. Schleiniger (Newark, DE, USA) Corner flow of a suspension of rigid rods R.A. Keiller and E.J. Hinch (Cambridge, UK) The free energy of a deforming Lodge rubber-like liquid J.R. Prakash and R.A. Mashelkar (Pune, India) Deformation and breakup of visocelastic drops in planar extensional flows W.J. Milliken and L.G. Leal (Santa Barbara, CA, USA) Short communication Utilization of double-step shear strain experiments in the evaluation of rheological con- stitutive equations J.S. Vrentas and C.M. Vrentas (University Park, PA, USA) and D.C. Venerus (Chicago, Calendar Subject Index of Vol. 40 Author Index of Vol. 40 Contents of Vol. 40