NOTES TO RULE 21
Notes of Advisory Committee on Rules.
See English Rules Under the Judicature Act (The Annual Practice, 1937) O 16, r 11. See also Equity Rules 43 (Defect of Parties--Resisting Objection) and 44 (Defect of Parties--Tardy Objection).
For separate trials see Rules 13 (i) (Counterclaims and Cross-Claims: Separate Trials; Separate Judgments), 20(b) (Permissive Joinder of Parties: Separate Trials), and 42(b) (Separate Trials, generally) and the note to the latter rule.