The voice of the keeper, with a very limited vocabulary of articulate sounds, serves almost alone to guide the elephant in his domestic occupations.[154] Sir EVERARD HOME, from an examination of the muscular fibres in the drum of an elephant’s ear, came to the conclusion, that notwithstanding the distinctness and power of his perception of sounds at a greater distance than other animals, he was insensible to their harmonious modulation and destitute of a musical ear.[155] But Professor HARRISON, in a paper read before the Royal Irish Academy in 1847, has stated that on a careful examination of the head of an elephant which he had dissected, he could “see no evidence of the muscular structure of the _membrana tympani_ so accurately described by Sir E. HOME.” Sir EVERARD’S deduction, I may observe, is clearly inconsistent with the fact that the power of two elephants may be combined by singing to them a measured chant, somewhat resembling a sailor’s capstan song; and in labour of a particular kind, such as hauling a stone with ropes, they will thus move conjointly a weight to which their divided strength would be unequal.[156] Nothing can more strongly exhibit the impulse to obedience in the elephant, than the patience with which, at the order of his keeper, he swallows the nauseous medicines of the native elephant-doctors; and it is impossible to witness the fortitude with which, without shrinking, he submits to excruciating surgical operations for the removal of tumours and ulcers, without conceiving a vivid impression of his gentleness and intelligence. Dr. DAVY when in Ceylon was consulted about an elephant in the Government stud, which was suffering from a deep, burrowing sore in the back, just over the back-bone, and this had long resisted the treatment ordinarily employed. He recommended the use of the knife, that vent might be given to the accumulated matter, but no one of the attendants was competent to undertake the operation. “Being assured,” he continues, “that the creature would behave well, I undertook it myself. The elephant was not bound, but was made to kneel down at his keeper’s command—and with an amputating knife, using all my force, I made the incision required through the tough integuments. The elephant did not flinch, but rather inclined towards me when using the knife; and merely uttered a low, and as it were suppressed, groan. In short, he behaved as like a human being as possible, as if conscious (as I believe he was), that the operation was for his good, and the pain unavoidable.”[157]