Hence, even in the domain of natural science the aid of the experimental method becomes indispensable whenever the problem set is the analysis of transient and impermanent phenomena, and not merely the observation of persistent and relatively constant objects.
![The idea of protoplasm, which was really a name for our ignorance, [is] only a little less misleading than the expression Vital force.](https://img.libquotes.com/pic-quotes/v1/j-b-s-haldane-quote-lbk8x3h.jpg)
![The idea of protoplasm, which was really a name for our ignorance, [is] only a little less misleading than the expression Vital force.](https://img.libquotes.com/pic-quotes/v2/j-b-s-haldane-quote-lbk8x3h.jpg)
![The idea of protoplasm, which was really a name for our ignorance, [is] only a little less misleading than the expression Vital force.](https://img.libquotes.com/pic-quotes/v3/j-b-s-haldane-quote-lbk8x3h.jpg)
![The idea of protoplasm, which was really a name for our ignorance, [is] only a little less misleading than the expression Vital force.](https://img.libquotes.com/pic-quotes/v4/j-b-s-haldane-quote-lbk8x3h.jpg)
