3. This group contains the name of the grandson (Benjamin Harrison) of William Henry Harrison, of the second group. The only other instance of relationship between the Presidents was in the case of John Adams and his son, John Quincy Adams of the first group.

4. This group contains the name of the only President (Andrew Johnson) who was ever sought to be impeached. The prosecution failed to convict, having lacked one vote of the number necessary for a conviction.

5. Grover Cleveland affords the first instance where the two terms of a President are separated by the full term of another President (Benjamin Harrison). [←ToC]

‌ENGLISH SOVEREIGNS.
A UNIQUE EXERCISE.

The method here used of memorising the order of the English sovereigns from William I., the Conqueror, to Victoria possesses the following novelties:—

(1) We learn the order of the entire series of thirty-seven sovereigns by means of the relations, direct and indirect, which we establish with the reigning sovereign, Victoria.

(2) The precise credit is claimed for this method which it is entitled to receive. In a list of proper names we sometimes have several surnames alike, with usually a difference of Christian names, as in the presidential series we have—William Henry Harrison and Benjamin Harrison, and John Adams and John Quincy Adams, and we also sometimes have the same Christian names prefixed to different surnames, as James Madison and James Monroe. But in the Sovereigns of England, from William I. to Victoria, we have many Christian names alike, and the differences indicated by ordinal numbers, as George I., George II., George III., George IV. This order of the English Kings is most extraordinary, neither the Popes of Rome, nor the French, nor any other list of kings, furnishing any parallel in more than a few incidents. It is these unique coincidences and recurrences that make it so easy to find relations between these sovereigns. This method is not applicable to the American Presidents, Prime Ministers of England, or hardly any other series.

(3) No accidental relations of parts of names is resorted to, as was done in the case of the American Presidents.

(4) The series is so taught that it can be recited forwards‌ and backwards—the only true test of learning any series.