## Contents of Volume 55

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- Approximation theories for measure preserving transformations
- Paul R. Halmos PDF
- Trans. Amer. Math. Soc.
**55**(1944), 1-18

- Some results in the theory of quasigroups
- Richard H. Bruck PDF
- Trans. Amer. Math. Soc.
**55**(1944), 19-52

- Interpolation and approximation by functions analytic and bounded in a given region
- E. N. Nilson and J. L. Walsh PDF
- Trans. Amer. Math. Soc.
**55**(1944), 53-67

- Some properties of ideals in rings of power series
- Claude Chevalley PDF
- Trans. Amer. Math. Soc.
**55**(1944), 68-84

- Positive temperatures on an infinite rod
- D. V. Widder PDF
- Trans. Amer. Math. Soc.
**55**(1944), 85-95

- Quasi-analyticity and analytic continuationâ€”a general principle
- S. Mandelbrojt PDF
- Trans. Amer. Math. Soc.
**55**(1944), 96-131

- The identity of weak and strong extensions of differential operators
- K. O. Friedrichs PDF
- Trans. Amer. Math. Soc.
**55**(1944), 132-151

- On the extension of linear transformations
- Andrew Sobczyk PDF
- Trans. Amer. Math. Soc.
**55**(1944), 153-169

- On certain integrals
- A. Zygmund PDF
- Trans. Amer. Math. Soc.
**55**(1944), 170-204

- A theory of covering and differentiation
- Anthony P. Morse PDF
- Trans. Amer. Math. Soc.
**55**(1944), 205-235

- The $\phi$ rectifiable subsets of the plane
- A. P. Morse and John F. Randolph PDF
- Trans. Amer. Math. Soc.
**55**(1944), 236-305

- Tensor theory of invariants for the projective differential geometry of a curved surface
- Thomas C. Doyle PDF
- Trans. Amer. Math. Soc.
**55**(1944), 306-348

- On a problem of Walsh concerning the Hadamard three circles theorem
- Maurice H. Heins PDF
- Trans. Amer. Math. Soc.
**55**(1944), 349-372

- Contributions to the analytic theory of $J$-fractions
- H. S. Wall and Marion Wetzel PDF
- Trans. Amer. Math. Soc.
**55**(1944), 373-392

- Postulate-sets for Boolean rings
- B. A. Bernstein PDF
- Trans. Amer. Math. Soc.
**55**(1944), 393-400

- Quasigroups. II
- A. A. Albert PDF
- Trans. Amer. Math. Soc.
**55**(1944), 401-419

- Surface area. I
- Herbert Federer PDF
- Trans. Amer. Math. Soc.
**55**(1944), 420-437

- Surface area. II
- Herbert Federer PDF
- Trans. Amer. Math. Soc.
**55**(1944), 438-456

- A new criterion for completely monotonic functions
- Harry Pollard PDF
- Trans. Amer. Math. Soc.
**55**(1944), 457-464

- Metric foundations of geometry. I
- Garrett Birkhoff PDF
- Trans. Amer. Math. Soc.
**55**(1944), 465-492

- Galois connexions
- Oystein Ore PDF
- Trans. Amer. Math. Soc.
**55**(1944), 493-513

- Closure operators and Galois theory in lattices
- C. J. Everett PDF
- Trans. Amer. Math. Soc.
**55**(1944), 514-525