Abstract: An automatic analytic apparatus of liquids has a liquid analyzer; a gas-admissible tube connected to the analyzer so as to conduct a liquid thereto; and means to collect a specified amount of liquid sample being analyzed, and, each time the collected amount of said liquid reaches said specified amount, automatically carry the liquid sample batch forward with a prescribed amount of air or any other inert gas interposed between the adjacent batches of said liquid sample, thus continuously passing alternate series of flowing liquid and gas batches respectively having a predetermined quantity through the above-mentioned tube.