このflos substantiaeという概念について昨日Ｈさんに教えていただきました。
http://ndpr.nd.edu/review.cfm?id=6503
によると
Andreas Blank, Leibniz: Metaphilosophy and Metaphysics 1666-1686, 2005
という本が出ていて、その中でこの概念が扱われているようです。
In chapter 4 Blank extends this kind of analysis to the issues of confused conception, corporeal substances, and the union of soul and body.
He places Leibniz's early views on the connection between soul and body in the context of the thought of Scaliger, Sennert and Boyle, arguing (as I have also independently argued in Arthur 2006) that Leibniz's views about the soul being co-extensive with the body in only an analogical sense are conformable with those of Scaliger and Sennert, and that Boyle's re-interpretation of the alchemical idea of a "flower of substance" along materialist lines is corrected by Leibniz only to the extent that he insists that the soul must be implanted in this flower of substance.
This interdependence of soul and organic body is crucial in the theory of confused perceptions, where "bodily traces play a constitutive role for the soul's activity" (p. 18), thus accounting not only for the multiplicity and imperfection of the material world, but also the necessity of an organic body to substances: if they did not possess an organic body, "immaterial substances would not display confused perception" (p. 100).
同じ内容が
「ゼンネルトとライプニッツにおける動物発生と実体」Arthur, R. T. W. (2006). "Animal Generation and Substance in Sennert and Leibniz", chapter 7 in The Problem of Animal Generation in Modern Philosophy, ed. Justin E. H. Smith. Cambridge: Cambridge University Press, 2006（『近代哲学における動物発生の問題』所収）.
という論文でも扱われているらしいです。この論集は5月発売予定なのになぜか日本のアマゾンではまだ買えません。これ読んでみたいなぁ。
