Abstract: An automatic incubator comprises a chamber surrounded by a water jacket and insulation and provided with temperature and gas level sensors, a gas injection solenoid valve and separate water jacket and air heaters together with microprocessor proportional-integral-derivative control for regulating temperature and gas concentration within the chamber. A fan is provided to circulate gas within the chamber and distribute heat. Manual set controls for selecting desired temperature and gas levels are provided as well as temperature and gas level displays, high and low temperature and gas indicators, and a low water jacket level indicator.