A method for preparing a sample slide, characterized in that a liquid containing a cell floating therein is fixed under an atmosphere for extension wherein an index of dryness as a control parameter in the preparation of a sample slide foe a material to be tasted is adjusted at a level such that the optimum condition is achieved for the preparing of a sample slide. Preferably, the support is a \u03b2-SiC foam with a specific area of between 10 and 500 m2g. The components are combined together to form a mixture.