*Editors*: D.G. Bourgin (Houston), J. Hausen (Houston), G.G. Johnson (Houston), B. Jóhnson (Nashville), J.W. Neuberger (Emory), B.H. Neumann (Australian National University)
*Managing Editor*: A. Lelek (Houston)
*Associate Managing Editor*: J.A. Johnson (Houston)

Houston Journal of Mathematics

*Contents*

**J. T. Arnold, M. B. Boisen, Jr.
**

Simple Going Down and Going Down, pp.
455-465.

**Kirby A. Baker
**

Definable Normal Closures in Locally Finite Varieties of Groups, pp.
467-471.

**John T. Baldwin, Joel Berman
**

Elementary Classes of Varieties, pp. 473-492.

**Wayne C. Bell
**

Addendum to ``Hellinger Integrals and Set Function Derivatives'', pp. 493-496.

**Ezra Brown
**

The Class Number of Q(sqrt(-pq)), for p , pp.
497-505.

**S. H. Kulkarni, B. V. Limaye
**

Spectral Mapping Theorem for Real Banach Algebras, pp.
507-517.

**Alan Lambert
**

Ergodic Theory and the Point Spectra of Weighted Composition Operators, pp.
519-523.

**Ralph McKenzie, Constantine Tsinakis
**

On Recovering a Bounded Distributive Lattice From Its Endomorphism Monoid, pp.
525-539.

**M. A. Natsheh
**

PL Involutions of K x S^{1} With a Two-Dimensional Fixed-Point Set Component, pp.
531-535.

**K. Satyanarayana, K. Kuppu Swamy Rao
**

Full Collineation Group of the Second of Foulser's Flag Transitive Planes of Order 25, pp.
537-543.

**Albert Shar
**

Homotopy Torsion Free H-Spaces, pp.
545-549.

**J. E. Smith
**

A New Family of l-Group Varieties, pp. 551-570.

**R. E. Stong
**

Highly Parallelizable Manifolds With Involution, pp. 571-586.

**Alasdair Urquhart
**

The Decision Problem for Equational Theories, pp.
587-589.

**John J. Walsh, David C. Wilson
**

The Non-Existence of Continuous Decompositions of 3-Manifolds Into Absolute Retracts, pp.
591-595.

**David G. Winslow
**

Cyclic Actions on S^{2} x (0,1), pp. 597-604.