Adam Clarke on Numbers 11:7

The manna was as coriander seed - Probably this short description is added to show the iniquity of the people in murmuring, while they had so adequate a provision. But the baseness of their minds appears in every part of their conduct. About the bdellium of the ancients the learned are not agreed; and I shall not trouble the reader with conjectures. See the note on Gen 2:12. Concerning the manna, see the notes on Exodus 16 (note). Num 11:11-15. The complaint and remonstrance of Moses in these verses serve at once to show the deeply distressed state of his mind, and the degradation of the minds of the people. We have already seen that the slavery they had so long endured had served to debase their minds, and to render them incapable of every high and dignified sentiment, and of every generous act.