Lectures on Conditioned Reflexes : Twenty-five year sof Objective Study of the Higher Nervous Activity (Behavior) of Animals
New York: International Publishers 1928. First Edition. 414 pages. 8vo. Black cloth gilt with embossed emblem of International Publishers lower front right board. Original dust jacket present, often missing. The fugitive light purple now faded to brown at the spine and varying degrees of purple elsewhere (still bright on the internal flaps). Soiling, chipping, wear and tears/creasing to the dust jacket - not a great example but present nonetheless. Original 6.50 price present on front flap. Clean internally. A touch of mottling to the cloth, only visible in raking light. Round label of bookseller "The Norman, Remington Co, Baltimore" on rear pastedown. Very Good / fair. Cloth. 
The true first edition of this work. Liveright (often noted as a first American edition) also issued an edition of this work dated 1928, but the copyright credits International Publishers. By this time Liveright was having serious financial problems due to the founder's poor financial management and his other ventures.
Translated from the third Russian edition, this volume contains five new chapters from the Author. The translator notes: "We regret we were not able to translate the fiery ardour which glows in the original - the zeal for the hunt of scientific facts". A second volume was published in 1941.
"Besides his important work on digestion, Pavlov is remembered for his investigations upon conditioned reflexes. He is one of teh greatest physiologists of all time. An English translation of another work by Pavlov, entitled 'Conditioned Reflexes' appeared in 1927" (Garrison Morton 5/1445)
Ivan Pavlov was awarded the Nobel Prize in Physiology or Medicine in 1904 "in recognition of his work on the physiology of digestion, through which knowledge on vital aspects of the subject has been transformed and enlarged."