gray matter

"By using the gray matter at the back of my head," was the reply.

Besides, he was going to stand deeply in need of his gray matter, if he hoped to get out of this one.

As in the brain, however, all the active powers of the cord are confined to the gray matter.

Over all was a still, deathly cold that froze the gray matter stiff.

I suppose some old road was opened again in the gray matter of his brain.

How long he sat there, letting thoughts happen dreamily rather than producing them of gray matter, he did not know.

The posterior root is distinguished by possessing a ganglion of gray matter, and by a somewhat larger size.

You cow-headed gents think beef an' brawn ought to hev the call over skill an' gray matter.

We know that every change of consciousness is accompanied by a rearrangement of the molecules in the gray matter; and that is all.

The organ is asthmatic and the wheezing gets on my gray matter.