Carpenter's principles of human physiology . sarily the same relation to one anotheras the weights they represent, it is clear that the differences of length between the line0 and the lines 4, 5, 6, &c, indicate what weight must be employed in order that theperceptible difference should be quadrupled, quintupled, &c. The psycho-physical law which 780 ON THE STRUCTURE AND FUNCTIONS OF MUSCULAR TISSUE. Fecbner has deduced from this is that within certain limits sensation increases as tlielogarithms of the stimulus; in other words, sensations increase as the logarithms, whilst theexcitations incr
Carpenter's principles of human physiology . sarily the same relation to one anotheras the weights they represent, it is clear that the differences of length between the line0 and the lines 4, 5, 6, &c, indicate what weight must be employed in order that theperceptible difference should be quadrupled, quintupled, &c. The psycho-physical law which 780 ON THE STRUCTURE AND FUNCTIONS OF MUSCULAR TISSUE. Fecbner has deduced from this is that within certain limits sensation increases as tlielogarithms of the stimulus; in other words, sensations increase as the logarithms, whilst theexcitations increase as ordinary numbers. If we represent the stimulus as R and the cor-responding sensationas S, while C representsthe constant propor-tional, then S = C when the minimumstimulus is taken = psycho-physicallaw only holds goodwithin a certain this the sen-sation increases moreand more slowly, andsoon a maximum ex-citation is reached,beyond which the re-lation between stimu-lus and sensation nolonger CHAPTER XV. ON THE STRUCTURE AND FUNCTIONS OF MUSCULAR TISSUE. 1. Structure of Muscular Tissue. 613. The capability of executing movements effecting change of place orof form is a power that is so widely distributed through the animal body,that it has been questioned whether every cell or mass of germinal matterdoes not possess it at some period of its development. The gradual altera-tion of shape exhibited by the white corpuscles of the blood (§ 174), by thecorpuscles of lymph (§154) and pus (§ 324), by the salivary corpuscles (§ 104),and connective tissue (§ 45), and by pigment* (§ 44) and cartilage cells aswell as the rhythmical protoplasmic movements observed in the eggs ofosseous fishes,j represent, perhaps, the simplest modes in which this power isdisplayed. The movements presented by the greater number of these cellsor corpuscles resemble those performed by the germinal mass of which anAmoeba is composed, the form altering from round t
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