6.361 In Hertz’s way of speaking, one could say: Only regular [law-like, lawful] combinations [connections] are thinkable.
This net rules out lawlessness or chance in nature. Pears & McGuinness have “subject to law” instead of “regular.” Ogden has “uniform” even though Wittgenstein said this was wrong and told him to look up the English translation of Hertz (Letters to Ogden p. 35). I have not found the relevant passage in Hertz yet.
Black (p. 362) says the allusion to “Hertz’s terminology” is obscure. He suggests (pp. 362-3) that Wittgenstein might have had in mind something like this passage from Hertz’s Principles § 109: “There exists a connexion between a series of material points when from a knowledge of some of the components of the displacements of these points we are able to state something as to the remaining components.”