By "matter" he did not mean to specialise rocks any more than protoplasm or ether.
I think it is certain that the way to get most enjoyment from books is to specialise a little.
She was not a bit like the polite young lady above, who seemed to specialise in noisy tipplers.
I did not specialise individuals, possibly because Radley was one.
The question was to a certain extent crude, "Why need he be a poet, why need he so specialise?"
It has had no schools of instruction, nor does it send its members to specialise in any particular branch.
There are officers who specialise in this perilous and wonderful business.
So vast is the field of biology, that now-a-days biologists are compelled to specialise to some extent.
To an observant eye and a listening ear he adds a charm of manner which is rare amongst authors who specialise in travel-talk.
People must know what they want, and go to the shops which specialise in the particular article.
specialize spe·cial·ize (spěsh'ə-līz')
v. spe·cial·ized, spe·cial·iz·ing, spe·cial·iz·es
To limit one's profession to a particular specialty or subject area for study, research, or treatment.
To adapt to a particular function or environment.