1) TEANSACTIONS I.I\ KKi'ooi. BIOLOGICAL SOCIETY. 



and progression, we should naturally expect no dift'er- 

 ence in functional activity between the two sides, but, 

 nevertheless, there is some evidence that the right fore 

 and hind Legs in the ox, the sheep, and the horse are 

 heavier than those on the left side. In cantering the 

 horse leads oft' with the right foot; kicking, however, 

 seems to be done quite impartially with right and left; 

 the evidence as regards the preponderance of one side in 

 these animals is as yet, however, inconclusive. Among 

 the Rodents a French naturalist has described definite 

 right-handedness, but I have been unable to obtain the 

 reference. Among Squirrels, Marmots, the Jerboa, the 

 Mouse, and the Rat, I have been unable to satisfy myself 

 that there is any distinct preferential use of either Bide. 

 Among Carnivora, and especially the Felidae, the 

 specialised uses of the anterior limb are considerable, 

 thus far, however, in none of them have I seen clear proof 

 of right-handedness. The Bear uses his upper limb for 

 many purposes, but after observing about half a dozen 

 witJi some care I have tailed to discover any preference 

 in the use of the one limb. The Quadrumana shew very 

 marked right-handedness; I have tested a large number 

 of individuals and find them nearly all right-handed, and 

 other observers, as, for example, Dr. W. Ogle,* has noted 

 the same. I have had no evidence of a preferential use 

 of the right hind limb. 



It is in the human species that right-handedness is 

 most pronounced. In fact, both right arm and right leg 

 are somewhat Larger and more muscular than the left. 

 According to Ogle a little over ninety-five per cent, of 

 English people are right-handed, and nearly five per cent. 

 Left-handed. Left-handedness is much more frequent in 

 \Uv male than in the female. Preferential use of the 



* Loc. cit. 



