Mach wrote a series of books and many articles devoted to issues bordering on philosophy the history of science, the problems of the development of science, scientific knowledge (first of all, the relationship between theory and observation, theory and experiment, etc.). p. ). These works brought him wide popularity, And not just because of CM. that popularized scientific knowledge (and at the turn of the last two centuries science, Although it was shaken by internal contradictions and even crises ,. was still in favor - after all, traditional philosophy ("metaphysics") was earlier Following the religion, It has been heavily criticized by ,. including natural scientists, From which philosophy could not recover for a long time and to claim respect in public opinion could only then, when she declared herself "scientific" and declared commitment to scientific values). Everything that happened in the “city of scientists” was of interest to the general public. Foreword by the author to the 1st edition. Deeply convinced that biology, and precisely the analysis of sensations, will play a great role in clarifying the main issues of science in general and physics in particular in the near future, I have repeatedly returned to the study of this science. Of course, my assistance in achieving this goal could not have been great.. I did my research in this area only by accident as it is not my specialty often returning to them only after long breaks. The works I published, scattered in various places, could not but lose their meaning, causing, perhaps, even many reproaches that I scatter .. All the more I owe a debt of gratitude to those researchers like Goering, F. Hensen, W. Preyer et al . , who drew attention to these my works, focusing on their internal content or on methodological techniques. In the book proposed here, I have gathered together the conclusions that those studies have led me to, setting them out in a complete and summarized form .. I would like to hope that it will be better received, for it clearly shows that in all such separate investigations of particular factors I have always been occupied with the same problem. Not at all claiming the title of physiologist and, moreover, a philosopher. I hope it is ,. The work of a physicist , Even though it is beyond ,. generally accepted in his specialty, but undertaken solely out of a lively curiosity , It will not be useful for others ,. It will not be useful even in this case ,. If not all my conclusions were correct.