自然科学是理论上对自然的征服,因此,离开理论思维,就不可能产生自然科学。自然界的各种现象,人类可以在实践的过程中感觉到,但要理解其本质和规律性,则必须通过理论思维。在科学史上,逻辑中的类比方法,就对细胞学理论的产生起到了助发现作用。十九世纪动植物解剖研究的兴起和理论思维的发展,人们逐渐认识到 Natural science is the conquest of nature in theory. Therefore, it is impossible to produce natural science without theoretical thinking. All kinds of phenomena in nature, human beings can feel in the process of practice, but to understand its essence and regularity, we must pass theoretical thinking. In the history of science, the analogy in logic played a role in helping to discover the theory of cytology. The rise of the nineteenth century animal and plant anatomy and the development of theoretical thinking, people gradually realized