This is a first paperback printing of Donovan's Brain by Curt Siodmak, published in 1950 by Bantam Books.  It is the inspiration for the classic sf/horror movie of the same title.  

From the publisher:

DEAD…Doomed by disease, then mangled in a plane crash, there was no doubt that Donovan was dead.

YET…floating in a tank of nutrient, linked to complex apparatus, Donovan’s brain still lived…

ALIVE…someone walked with Donovan’s gait, wrote his signature, knew his foulest secrets—and carried out his last, weirdest plan!

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