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Arp's chains of peculiar objects and Tifft's bands of velocities form an important non-classical part of the subclustering branch in galaxy science, which (this branch) is theoretically and empirically progressive, is not degenerating.

Arp recognized chains of peculiar galaxies which are different from so-called 100 Mpc filaments - they are different also in a sense of procedures which preserve different sets of hypothesis which are not subject to falsification. The branch of Arp's investigations is less connected with the readjusting the long known, old-fashioned (conservative) and "obvious" claiming that galaxies are concentrated into grains as in the case of globulars, film cermets and generally into "things" known from a cermet-like heuristic which comes from the whole tradition of Earth-bound laboratory and technical experience and from the intuitive and Newtonian-Kantian mode of growth of star clumps (Einasto et al., 1989; Grabinska 1983, 1985, 1986, 1988, 1989, 1992, 1993; Grabinska and Zabierowski 1987; Rudnicki 1978; Lachieze-Rey 1986).

The past encounter of Fornax and its perigalaction had as consequence the changing of the Fornax structure.

1. According to Hodge (1966) restructuralization of the Fornax density profiles proves that galaxies go round in an elliptical (Keplerian) motion. I am afraid that this vision of the Keplerian motion had been wrongly - but widely! accepted, particularly at the decades when the short scale of the Universe age (H = 100 kms^-1Mpc^-1) was generally submitted.
2. The aim of the Keplerian-like conceptualization is to obtain the agreement between the computed tidally limited radius r_t and the observed tidally limited radius r_l of the Fornax system of star collection. Very much conflict is observed because r_t = 7.0 kpc is two times greater than r_l = 3.1 kpc. This noticeable divergence had been discussed by Hodge and he claimed that the observed radius of the Fornax system was the tidal radius imposed at perigalaction meeting. The new value of r_t is much reduce, just by the factor 2.3.