What is a Barnes dropping bottle used for?

Barnes dropping bottles are used in microbiology laboratories for the dilution and dispensing of bacterial cultures. They are made of glass and consist of a cylindrical reservoir with a long, thin neck that has a small opening at the end. The bottle is partially filled with a liquid culture of bacteria and then sealed with a rubber stopper. To dispense the culture, the stopper is removed and the bottle is held upside down. The liquid is forced out of the bottle by gravity, and drops of the culture are dispensed onto a culture plate or slide.

Barnes dropping bottles are a convenient and accurate way to dispense bacterial cultures. They are also easy to clean and sterilize, which is essential for preventing contamination of cultures.