201. Debate in a deliberative assembly must be distinguished from forensic debate, or that which takes place before a judicial tribunal; the former being, in theory, at least, more the expression of individual opinions among the members of the same body; the latter more a contest for victory, between the disputants, before a distinct and independent body; the former not admitting of replies; the latter regarding reply as the right of one of the parties.[25]

202. It is a general rule, in all deliberative assemblies, that the presiding officer shall not participate in the debate, or other proceedings, in any other capacity than as such officer. He is only allowed, therefore, to state matters of fact within his knowledge; to inform the assembly on points of order or the course of proceeding, when called upon for that purpose, or when he finds it necessary to do so; and on appeals from his decision on questions of order, to address the assembly in debate.

Manual of Parliamentary Practice — Part 46

203. When a member desires to address the assembly, on any subject before it (as well as to make a motion), he is to rise and stand up in his place, uncovered, and to address himself not to the assembly, or any particular member, but to the presiding officer, who, on hearing him, calls to him by his name, that the assembly may take notice who it is that speaks, and give their attention accordingly. If any question arises, as to who shall be entitled to the floor, where several members rise at or nearly at the same time, it is decided in the manner already described (47), as to obtaining the floor to make a motion.

Manual of Parliamentary Practice — Part 46

204. It is customary, indeed, for the presiding officer, after a motion has been made, seconded, and proposed, to give the floor to the mover,[26] in preference to others, if he rises to speak; or, on resuming a debate, after an adjournment, to give the floor, if he desires it, to the mover of the adjournment, in preference to other members; or, where two or more members claim the floor, to prefer him who is opposed to the measure in question; but, in all these cases, the determination of the presiding officer may be overruled by the assembly.

Manual of Parliamentary Practice — Part 46

205. It is sometimes thought, that, when a member, in the course of debate, breaks off his speech, and gives up the floor to another for a particular purpose, he is entitled to it again, as of right, when that purpose is accomplished; but, though this is generally conceded, yet, when a member gives up the floor for one purpose, he does so for all; and it is not possible for the presiding officer to take notice of and enforce agreements of this nature between members.