The present invention comprises a specimen preserver. A bubble reservoir is used to hold a preserving liquid such as artificial cerebrospinal liquid (aCSF). Oxygen is introduced into the aCSF by a gas diffuser which is attached to the bubble reservoir. The tissue samples are contained in one or more chambers in a holding platform. The platform is suspended well above the bottom of the bubble reservoir. The lower portion of each of the chambers is open toward the bottom of the bubble reservoir, but is covered by a fine mesh. The gas introduced into the aCSF circulates within the bubble reservoir. However, the tissue samples are not directly exposed to the gas bubbles because the fine mesh excludes the bubbles from the chambers in which the tissue samples are housed.