Reference request: Oldest books on logic with unsolved exercises?

I have not succeeded in going back much more than 50 years for a textbook on mathematical logic with excercises:

• Introduction to Mathematical Logic, by Elliott Mendelson (1964)

• Mathematical Logic, by Joseph Shoenfield (1967)

• Mathematical Logic: A First Course, by Joel Robbin (1969)

one exercise from the 1964 book

In Symbolic Logic by Lewis Carroll (1896), most of the exercises have solutions, but there are four problems in the appendix (pp. 185-188) that do not. Carroll writes "I shall be very glad to receive, from any Reader, who thinks he has solved any one of them, what he conceives to be its complete Conclusion."

(These four problems were apparently meant as a preview of Part II of the work, which Carroll did not complete before his death in 1898. It seems a version was eventually published in 1977.)

The update to the question now asks for "logic at large" -- rather than specifically mathematical logic. Then one can go back to before the 20th century, as in:

• Studies and exercises in formal logic, J.N.Keynes, 1884.

• Questions and exercises in elementary logic, deductive and inductive, W.H. Forbes and D. Hird, 1875.

• Exercises in logic, J.T. Gray, 1845.

• Logic; or, The art of reasoning simplified. With exercises on a variety of interesting topics, to guide and develope the reasoning powers of the youthful inquirer after truth, S.E. Parker, 1837.

one exercise from Keynes