## Contents of Volume 131, Number 2

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- The word problem and consequences for the braid groups and mapping class groups of the $2$-sphere
- Richard Gillette and James Van Buskirk PDF
- Trans. Amer. Math. Soc.
**131**(1968), 277-296

- Harmonic differential with prescribed singularities
- Mitsuru Nakai PDF
- Trans. Amer. Math. Soc.
**131**(1968), 297-302

- The minimal boundary of $C(X)$
- S. L. Gulick PDF
- Trans. Amer. Math. Soc.
**131**(1968), 303-314

- Injective hulls of $C^*$ algebras
- Harry Gonshor PDF
- Trans. Amer. Math. Soc.
**131**(1968), 315-322

- The $K$-theory of a class of homogeneous spaces
- Bruno Harris PDF
- Trans. Amer. Math. Soc.
**131**(1968), 323-332

- Secondary characteristic classes for $k$-special bundles
- Robert E. Mosher PDF
- Trans. Amer. Math. Soc.
**131**(1968), 333-344

- The monotone union property of manifolds
- Lawrence S. Husch PDF
- Trans. Amer. Math. Soc.
**131**(1968), 345-355

- Changes of variables near a periodic surface or invariant manifold
- Al Kelley PDF
- Trans. Amer. Math. Soc.
**131**(1968), 356-364

- Representation of bilinear forms in Hilbert space by linear operators
- Alan McIntosh PDF
- Trans. Amer. Math. Soc.
**131**(1968), 365-377

- Some new finite translation planes
- F. W. Wilke and J. L. Zemmer PDF
- Trans. Amer. Math. Soc.
**131**(1968), 378-397

- On the number of automorphisms of a closed Riemann surface
- Robert D. M. Accola PDF
- Trans. Amer. Math. Soc.
**131**(1968), 398-408

- Closure theorems for some discrete subgroups of $R^{k}$
- R. P. Gosselin PDF
- Trans. Amer. Math. Soc.
**131**(1968), 409-419

- Semirecursive sets and positive reducibility
- Carl G. Jockusch PDF
- Trans. Amer. Math. Soc.
**131**(1968), 420-436

- Singular integral operators over a Hilbert space
- Michael J. Fisher PDF
- Trans. Amer. Math. Soc.
**131**(1968), 437-465

- The Radon-Nikodym theorem for the Bochner integral
- M. A. Rieffel PDF
- Trans. Amer. Math. Soc.
**131**(1968), 466-487

- The characters of the finite symplectic group $\textrm {Sp}(4, q)$
- Bhama Srinivasan PDF
- Trans. Amer. Math. Soc.
**131**(1968), 488-525

- Recursive pseudo-well-orderings
- Joseph Harrison PDF
- Trans. Amer. Math. Soc.
**131**(1968), 526-543

- The structure and ideal theory of the predual of a Banach lattice
- E. B. Davies PDF
- Trans. Amer. Math. Soc.
**131**(1968), 544-555

- Correction to: “Higher obstructions to sectioning a special type of fibre bundle”
- W.-C. Hsiang PDF
- Trans. Amer. Math. Soc.
**131**(1968), 556