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

Houston Journal of Mathematics

*Contents*

**Christopher Allday
**

Rational Whitehead Products and a Spectral Sequence of Quillan, II, pp. 301-308.

**Zvi Arad, Marcel Herzog
**

On Fundamental Subgroups of Order Divisible by Three, pp.
309-313.

**Willem J. Blok, Peter Kohler
**

The Semigroup of Varieties of Generalized Interior Algebras, pp.
315-327.

**David Chillag
**

On Transitive Permutation Groups With an Imprimitivity Block of Prime Length, pp. 329-336.

**Leo P. Comerford, Jr.
**

A Note on Power-Conjugacy, pp.
337-341.

**Ronald J. Evans
**

Generalizations of a Theorem of Chowla on Gaussian Sums, pp.
343-349.

**Daniel L. Everett
**

Embedding Theorems for Decomposition Spaces, pp. 351-368.

**Robert Gilmer, Mark L. Teply
**

Idempotents of Commutative Semigroup Rings, pp.
369-385.

**Kyung Whan Kwun
**

Tameness of Ends in Covering Projections, pp. 387-394.

**Coy L. May
**

Cyclic Autoomorphism Groups of Compact Bordered Klein Surfaces, pp.
395-405.

**Lee Mohler
**

Sigma_{d}-Spaces Are Planar, pp. 407-408.

**Sam B. Nadler, Jr.
**

Arcwise Connected Locally Planar Cartesian Products, pp.
409-421.

**Jurg Schmid
**

Nonstandard Constructions for Join-Extensions of Lattices, pp.
423-439.

**C. D. Shannon
**

Lattice Ideals in the Space of Continuous Functions, pp. 441-452.