Slide showing diagram of 'three brood-capsules'. Slide shows black and white diagram labelled 'fig. 32 - three brood-capsules, containing Echinococcus-heads. Magnfied 76 diameters. (after Prof. Erasmus Wilson)'. Label at top 'Parasites and their hosts'. Labelled top left 'Laurie, London'. Small white sticker upper right corner '13'. Number '14' written on tape at top edge of slide. Late 19th - early 20th century