This does not mean that science is entirely untrammeled in the use of its liberty and need obey no laws. On the contrary, a fish lying on dry land is perfectly free, viz., to die and to perish, while a fish, which really shall be free to live and to thrive must be entirely surrounded by water and guided by its fins. In the same manner every science has to keep up the closest connection with its subject, and strictly to obey the claims of its proper method; and only when strictly bound by this double tie, can science move freely on.
