Objectives, 16 Objects, drawing of, 24 " photography of, 36 Oil-cells, 58, 61 Oscillatoriæ, 84 Osmic acid, 170 Parasites, 153 Petals, 69 Picric acid, 170 Pigment, 121 Pocket magnifiers, 13 Polariscope, 166 Pollen, 71 Polyzoa, 147 Pond-hunting, 132 Preservatives, 169 Radiolaria, 157 Rotifers, 147 Safranin stain, 183 Sap, 128 Scent-glands, 57 Sea-weeds, 92 Section-cutting, 178 Seeds, 75 Skin, 120 Spiracles, 102 Sponge, fresh-water, 135 " spicules, 155 Sporangia, 92 Stage-forceps, 116 Starch, 63 " mounting, 172 Stomata, 49 Suckers, 108 Teeth, 125 Troughs, glass, 18 Water-bears, 152 Wings, 110 Wool, 116 Worms, fresh-water, 14 " marine, 160 Yeast, 89 Zoœa, 161 Zoophytes, 157 Zygnemaceæ, 85 PRINTED BY MORRISON AND GIBB LIMITED, EDINBURGH End of Project Gutenberg's Common Objects of the Microscope, by J. G. Wood