| Title | Page | |
|---|---|---|
| Labels and Trademarks | 29 | |
| The Labor Strike | 111 | |
| Laundry Puzzle | 26 | |
| The Leaning Tower of Pisa | 154 | |
| A Legal Problem. | 74 | |
| Lewis Carrol's Monkey Puzzle | 44 | |
| The Lily Problem | 93 | |
| The Literary Burglars | 15 | |
| Literary Rebus. | 119 | |
| The Little Brown Jug | 122 | |
| The Lost Cent. | 39 | |
| Lost Opportunities | 170 |