Cassell's Natural History, Vol. 1 (of 6)Note 6 — Chapter I · INTRODUCTION—THE MAN-SHAPED APES—1. THE GORILLA (Troglodytes Gorilla).Reading editionThe Gibbons have no air sacs.◇Copy noteReturn to CHAPTER I. INTRODUCTION—THE MAN-SHAPED APES—1. THE GORILLA (Troglodytes Gorilla).