A holder holding in fixed array: (a) a plurality of vertically-extending slides each having a vertically-extending face, (b) a plurality of vertically-extending cover members, each having a vertically-extending face, each face of a vertically-extending slide being spaced by a first distance less than 0.5 mm from a face of a vertically-extending cover member. The holder engages the vertically-extending slides and vertically-extending cover members adjacent to their upper ends in a fixed array with the sample face of each slide being a first distance from a substantially parallel face of a vertically-extending cover member. The lower edge of each slide extends horizontally and is spaced from a substantially parallel horizontally-extending lower edge of a cover member by the first distance. The space between the horizontally-extending lower edges is open. Such an array can contact liquid with the lower edges and draw liquid by capillary action into each gap which is the first distance in thickness, such as treating liquid for samples immobilized on the slide face, cover member face or both.
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