The Microscope: Its History, Construction, and Applications ...

achromatic acid algæ angle animal animalculæ aperture appear arrangement axis beautiful become body bone bone-cells branches Busk calcareous Canada balsam canals cavity cells centre cilia colour composed consists covered crystals delicate dentine deposit diameters disc edge eggs Ehrenberg endoplasts examined exhibit extremity eye-piece fibres fleshy fluid Flustra Foraminifera gemmules glass granular matter hairs Haversian canals horny inch Infusoria insect instrument larvæ layer length lens lenses lines magnified mass matter membrane microscope microscopist minute motion mouth muscular nature nucleolus object object-glass observed organs outer papillæ passing pencil perfect periplast piece placed plants Plate polarised light polype portion prism proboscis raphides rays refraction resembling round screw seen shell side siliceous skin species specimens spicula spines sponges stage stem stomach structure substance surface tentacula thickness thin tion tissue tourmaline transparent transverse tube vegetable vessels Volvox whilst zoophyte