438 Canadian Record of Science 



a little stronger vitality on the right side over the left, 

 and would fully account for the difference previously 

 noted. 



The hindlegs in the horse which are so commonly 

 white as compared with the number of fore-legs white 

 may be due to the greater distance from the heart, the 

 centre of force of the supply. 



The conclusion the writer comes to from the observa- 

 tions recorded are that the right side of the bodies of 

 man and the quadrupeds are a trifle stronger than the 

 left, that this difference is caused by the little difference 

 in the directness of the blood supply. 



And that this difference accounts for the preponder- 

 ance of right-handed men over left-handed. 



And that the habit once established by natural causes 

 has been increased in man by heredity and education. 



But the cause of this determination of a slightly 

 increased supply of blood is still unexplained. 



Still the question, Why? remains. 



Reference and illustration has been made to plants 

 and a weakness shown to exist there when the normal 

 colour is absent. If now we go further, we find the snail 

 shell all rotating in the direction of the hands of a 

 watch, that is, from left to right, but if the snail be 

 watched in its egg during development it will be found 

 to slowly rotate in the opposite direction, the direction 

 from right to left; the writer has often watched them 

 under the microscope for hours before they passed from 

 the shell. 



If now we take a hyacinth or an onion and strip 

 off the leaves, we find the scars left on the flattened 

 disk arranged so as to produce an appearance like the 

 back of an engine turned watch with curves proceeding 

 from the outside to the centre in the direction of the 

 hands of a watch. The same appearance is found in the 

 sunflower disk (Helianthus annuus) when the flowers are 

 fallen, and the seeds are ripened they will be found 

 to be arranged in similar lines. In these cases the axis 



