The main differences between Bijou, McCartney and Universal Bottles lie in their specific designs and intended uses:

Bijou Bottle:

Small, narrow-necked glass container. Typically used for storing small quantities of liquid chemicals or reagents. Suitable for situations where only a small amount of a substance is needed, or for storing expensive or sensitive materials. Often used in chemical and biochemical laboratories.

McCartney Bottle:

Specialized container used in microbiology laboratories. Designed for the collection and enumeration of bacteria and other microorganisms in water samples. Facilitates the concentration of microorganisms from a large volume of liquid into a smaller, more manageable volume for analysis. Typically has a wide mouth and a narrow neck to aid in pouring and transferring samples.

Universal Bottle:

Versatile container used for the storage and transportation of various liquids. Available in different sizes and shapes to accommodate different volumes and types of substances. Used in a wide range of scientific disciplines, including chemistry, biology, and environmental science. Suitable for storing reagents, media, buffers, solutions, and other laboratory materials. Often equipped with screw caps or other closures to ensure a tight seal and prevent leaks or contamination.

In summary, while all three types of bottles serve as containers in laboratory settings, they are designed for different purposes and have distinct features tailored to their specific applications.