Progress in minute anatomy a feature of the eighteenth century. Attractiveness of insect anatomy. Enthusiasm awakened by the delicacy and perfection of minute structure, 89. Lyonet, 1707-1789, 90. Description of his remarkable monograph on the anatomy of the willow caterpillar, 91. Selected illustrations, 92-94. Great detail--4,041 muscles, 91. Extraordinary character of his drawings, 90. A model of detailed dissection, but lacking in comparison and insight, 92. The work of Réaumur, Roesel, and De Geer on a higher plane as regards knowledge of insect life, 95. Straus-Dürckheim's monograph on insect anatomy, 96. Rivals that of Lyonet in detail and in the execution of the plates, 99. His general considerations now antiquated, 99. He attempted to make insect anatomy comparative, 100. Dufour endeavors to found a broad science of insect anatomy, 100. Newport, a very skilful dissector, with philosophical cast of mind, who recognizes the value of embryology in anatomical work, 100. Leydig starts a new kind of insect anatomy embracing microscopic structure (histology), 102. This the beginning of modern work, 102. Structural studies on other small animals, 103. The discovery of the simplest animals, 104. Observations on the microscopic animalcula, 105. The protozoa discovered in 1675 by Leeuwenhoek, 105. Work of O.F. Müller, 1786, 106. Of Ehrenberg 1838, 107. Recent observations on protozoa, 109. CHAPTER VI Linnæus and Scientific Natural History, 110