Papers of David Skene: Volume of copy correspondence of David Skene: Copy Letter from David Skene to Carolus Linnaeus Copy letter from David Skene to Carolus Linnaeus in which he challenges Linnaeus' classification of zoophytes as compound animals on his animal kingdom in Systema Naturae (1764). Skene believes that scientists should not plan limits which are beyond nature and describes experiments he recently made on sertularia during which he saw voluntary movement, 16 December 1765. 16 December 1765