For a wet mount slide, place a very small drop of liquid (water, glycerin, oil, mounting solution) on the slide in which to suspend your sample. Place your sample in the center of the liquid and gently lower a glass coverslip onto the liquid. Start by touching one edge of the coverslip to the slide and gently lowering the coverslip onto the slide. This will allow bubbles to be pressed out as you lower the coverslip. For a dry mount slide, the specimen or sample is placed directly on the slide without a liquid or coverslip. Videos of how to prepare a slide properly can be found on YouTube.