The Relation of Science and Religion.pdf - Online Christian Library

232 SCIENCE AND RELIGION.brain, and both the front and rear parts ofthe organ are silent, offering no responsehowever stimulated. The explanationof this silence remains a matter of doubt.It may be that these portions of the brain areconcerned with movements which do not comeunder the observation of the operator, or thatthey are centres of sensibility from which nomovement can naturally follow, or that theyfulfil functions which can not be recognized bythis mode of experiment. Uncertainty hangsover this department in the investigation.The actual results may be indicated by afew examples. At a point well\forward inthe brain of the dog, ma,rked number one byFerrier, is a centre which when stimulatedleads to movement of the hind leg on the oppositeside; and by exciting another portionof the brain quite contiguous, marked numberfour, movement of the opposite fore leg isproduced. By exciting a point situated overthese two and on a distinct convolution, waggingof the tail is induced. By transferringthe needle to a point much lower down,towards the base of the brain, but still wellforward, marked by Ferrier nine, the mouthis opened and the tongue moved, while in