On the Variation of Species, with Especial Reference to the Insecta
 Followed by an Inquiry into the Nature of Genera

by Thomas Vernon Wollaston

"On the Variation of Species, with Especial Reference to the Insecta" by T. Vernon Wollaston is a scientific publication written in the mid-19th century. This treatise focuses on the variations observed in insect species, particularly those found in the Madeira Islands, and aims to address the significance of environmental influences on these variations. It serves as a call for naturalists to better understand and explore the complexities surrounding insect classification, specifically the differentiation between species and varieties. The opening of this work sets the stage for an in-depth discussion on the factors that contribute to insect variation, emphasizing the importance of external conditions like climate, geography, and ecological contexts. Wollaston begins with reflections on the inexhaustible nature of true knowledge in natural history and asserts that the understanding of species relies heavily on recognizing the impact of external factors. He introduces the complex interplay of climatic and geological factors in shaping insect characteristics, suggesting that variations previously overlooked deserve more serious investigation. The preface outlines his goal of making this intricate subject accessible to general naturalists, which becomes a recurring theme as he calls for more attention to the diverse influences on insect variation.