The multimedia microscope slide packages for embryology and development of animals come in a special cardboard box with an explanatory brochure and plastic box of 6 microscope slides: • Chicken, 36-hour, t.s. with neural tube, differentiation of mesoderm • Chicken, 48-hour, t.s. with differentiation of mesoderm and ectoderm • Chicken, 3-day, t.s. of head with primordium of brain, eyes and heart • Frog, early tail bud stage, t.s. with neural tube, notochord • Frog, young tadpole, t.s. through head • Mouse embryo, t.s. of head, development of hairs, brain, etc.