Explanation:

- Section 18: This section deals with the jurisdiction of courts when the local area within which the courts have jurisdiction is uncertain. It provides guidelines for such situations but is not related to the institution of suits.

- Section 20: This section pertains to where a suit can be filed, based on the defendant's residence or where the cause of action arises. It's related to jurisdiction but not directly to the institution of suits.

- Section 22: This section refers to the power of a court to transfer suits which is relevant to the transfer of suits, not their institution.

- Section 26: This section indeed deals with the institution of suits. It states that every suit shall be instituted by the presentation of a plaint or in such other manner as may be prescribed.