the apices (or other corôÙreôÙsponôÙding points) of all these triangles have their locus upon a logarithmic spiral: a result which follows directly from that alternative definition of the logarithmic spiral which I have quoted from Whitworth (p. 507).
Again, we may build up a series of right-angled triangles, each of which is a gnomon to the preceding figure; and here again, a logarithmic spiral is the locus of corôÙreôÙsponôÙding points in these successive triangles. And lastly, whensoever we fill up space with
a {513} collection of either equal or similar figures, similarly situated, as in Figs. 256, 257, there we can always discover