3. Joining the Rings
Nine rings are connected by six straight lines, as shown in [Fig. 2]. Connect these same nine rings by four straight lines.
4. The Ten Rows
This is a puzzle with nine checkers or counters. Dispose these counters in such a manner that ten rows are formed with three men in each row.
Fig. 3.—The cabalistic sign.
5. The Cabalistic Sign
[Fig. 3] shows a piece of paper cut into a famous cabalistic sign. How can you divide it into four pieces which, placed together, shall form a square?
6. The Dangerous Anarchists
Once upon a time there were eight anarchists confined in separate cells connected by the system of passages shown in [Fig. 4]. The prisoners, each of whom had his own number, occupied cells in the order shown.