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Humble creatures; part I. The earthworm, and the common housefly. In eight letters
General Research Division, The New York Public Library. "The fly: Fig. 1. Head of house-fly, magnified 20 diameters: a, a, feelers; b, b, compound eyes; c, proboscis, Fig. 2. Magnified portion of detached cornea, Fig. 3. Section of part of compound eye, Fig. 4. Five ocelli, highly magnified" The New York Public Library Digital Collections. 1860. https://digitalcollections.nypl.org/items/510d47da-670b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "The fly: Fig. 1. Head of house-fly, magnified 20 diameters: a, a, feelers; b, b, compound eyes; c, proboscis, Fig. 2. Magnified portion of detached cornea, Fig. 3. Section of part of compound eye, Fig. 4. Five ocelli, highly magnified" New York Public Library Digital Collections. Accessed January 24, 2025. https://digitalcollections.nypl.org/items/510d47da-670b-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1860). The fly: Fig. 1. Head of house-fly, magnified 20 diameters: a, a, feelers; b, b, compound eyes; c, proboscis, Fig. 2. Magnified portion of detached cornea, Fig. 3. Section of part of compound eye, Fig. 4. Five ocelli, highly magnified Retrieved from https://digitalcollections.nypl.org/items/510d47da-670b-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-670b-a3d9-e040-e00a18064a99 | title=
(still image)
The fly: Fig. 1. Head of house-fly, magnified 20 diameters: a, a, feelers; b, b, compound eyes; c, proboscis, Fig. 2. Magnified portion of detached cornea, Fig. 3. Section of part of compound eye, Fig. 4. Five ocelli, highly magnified, (1860)
|author=Digital Collections, The New York Public Library |accessdate=January 24, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>