FIG. 1 is a perspective view of my new, original ornamental design for a microscope laboratory slide, transparency shading being omitted from the specimen well portions for ease of illustration;

FIG. 2 is a top plan view of the slide;

FIG. 3 is a right side elevational view of the slide;

FIG. 4 is a rear elevational view of the slide;

FIG. 5 is a bottom plan view thereof.