“These are in two sets , the first, of 31 slides, shows transverse sections of teak wood, etc., stellate cells, parts of spiders, snails, sponges, etc.', the second set, of 34 slides, shows human fleas, a bed bug, crickets, spiders, parts of flies, beetles, etc. These slides reproduce in a popular manner the wonders of the microscope, showing markings which can only be otherwise seen with high powers of the microscope and with expensive instruments, and are such as cannot be rendered by microscopes attached to the lanterns, from insufficient light and consequent loss in definition, and it is intimated that starch granules already magnified on the slide 200 diameters are capable of enlargement to 4,800 diameters, if made to fill a disc of 6ft. diameter, and so on.”