Full Idea
Descartes thinks it is a pointless relic of scholastic metaphysics to dispute over the boundaries between substances and mere aggregates.
Gist of Idea
Descartes thinks distinguishing substances from aggregates is pointless
Source
report of René Descartes (works [1643]) by Robert Pasnau - Metaphysical Themes 1274-1671 25.6
Book Reference
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.604
A Reaction
This is Pasnau's carefully considered conclusion, with which others may not agree. It presumably captures the attitude of modern science generally to such issues.