Comic Title: Atom #21
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Oct/Nov 1965
On Sale Date: August 5, 1965 Newsstand Date August 5, 1965
Source: House Ad, Detective Comics #343, Page 22

Copyright Date August 5, 1965
Source: Library of Congress, Periodicals 1965

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: Julius Schwartz

Title: "The Adventure of the Canceled Birthday"
Pages: 11

Feature(s):
Atom (Ray Palmer of Earth-1)

Writer: Gardner F. Fox
Penciller: Gil Kane
Inker: Sid Greene

Reprinted In:
Showcase Presents:The Atom Vol. 2 TPB (2008)

Feature Character(s)

• Atom (last appearance in Atom #21; next appearance in Justice League of America #40)

Supporting Character(s)

• Alpheus V. Hyatt (last appearance in Atom #17; next appearance in Atom #27)

Villain(s)

• Reddy Bollins and a gang of Mohocks (no further appearances)

Other Character(s)

• Theodore Hyatt and Alfred (Professor Hyatt's ancestor and his father; no further appearances)
• William Hogarth (an artist; no further appearances)
• Judge Henry Fielding and John Fielding (his brother; no further appearances)

Synopsis:
The Atom travels in the Time Pool to 18th century London to view the birthday party of Professor Hyatt's ancestor, Theodore. The Atom finds Theodore upset because the change from the Julian calendar to the Gregorian calendar in 1752 has eliminated September 3rd, the boy's birthday. Atom then watches as Theodore father is robbed by a street gang. He attempts to stop the crooks, but the leader escapes with Hyatt's money.

The Atom accompanies Hyatt to visit Judge Henry Fielding to explain the robbery. The Atom proposes using deduction to solve the case. Atom tracks down the gang leader and recovers the money. Both the judge and his blind brother John are impressed with the idea of using detectives to solve crimes. When Atom returns to his own time, he remembers that John Fielding founded the first organized detective force.