Vol 42, No 6.

Contents:
5 • Radiation and Mutations • [Editorial (Astounding)] • essay by John W. Campbell, Jr. [as by The Editor]
8 • Seetee Shock (Part 1 of 3) • [Seetee • 2] • serial by Jack Williamson [as by Will Stewart]
50 • A Present from Joe • short story by Eric Frank Russell
62 • Manna • novelette by Peter Phillips
85 • The Little Blue Cells • essay by John R. Pierce [as by J. J. Coupling]
99 • You'll be Seeing Titanium! • essay by uncredited
100 • The Prisoner in the Skull • novelette by Henry Kuttner and C. L. Moore [as by Lewis Padgett]
134 • In Times to Come (Astounding, February 1949) • [In Times to Come (Astounding)] • essay by The Editor
135 • Next Friday Morning • short story by D. W. Barefoot [as by D. W. Meredith]
143 • Book reviews (Astounding, February 1949) • essay by P. Schuyler Miller and L. Jerome Stanton
146 • The Analytical Laboratory: November 1948 (Astounding, February 1949) • [The Analytical Laboratory] • essay by The Editor
147 • Brass Tacks & Letters
155 • Christmas Tree • short story by John Christopher [as by Christopher Youd].