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The hand is large, round, and legible at a glance; the lines far apart, and accurately equidistant; and the whole affair looks not unlike a company of regular troops in marching order. The signature has a point-like firmness and simplicity.
In fact, the larger the telescope and the more perfect the atmospheric conditions at the observer's command, the smaller do these images appear. On the photographic plate, it is true, the stars are recorded as measurable disks, but these are due to the spreading of the light from their bright point-like images, and their diameters increase as the exposure time is prolonged.
He would have pointed out that there would be no such thing as a knife with its line-like edge unless man were able to think the concept 'line', nor a needle with its point-like end unless he were able to think the concept 'point'. In fact, knife and needle are products of a human action which is guided by these two concepts respectively.
The railway bank was near, and in the network of wire stretched between it and us many bodies were fast-caught as flies. The elements had gradually dissolved those bodies and time had worn them out. With their dislocated gestures and point-like heads they were but lightly hooked to the wire.
Since, however, science was obliged to restrict itself to what could be observed with a single, colour-blind eye, physics has taken as its main object of research the spatio-temporal relationships, and their changes, between discrete, ideally conceived, point-like particles.
In his "Theoria philosophiæ naturalis," he tried to prove that bodies are composed not of a continuous material substance but rather of innumerable point-like structures or particles which are without any extension or divisibility. Boscovich's philosophical system can be called a dynamistic atomismus.
To this kind of observation nothing is accessible, we know, except spatial displacements of single point-like entities. Hence we find Bacon and Hooke already attributing the sensation of warmth to minute fast-moving particles of matter impinging on the skin. Some time later we find Locke taking up the same picture. We see from this how little the mechanical theory of heat owes to empirical facts.
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