Why the Majority of Men are Bight-Handed 137 



the left side of the vertebral column gradually coming 

 forwards from the left side of the column to the centre 

 of the front of the column where it divides into the right 

 and left common iliacs to supply the lower limbs, the 

 trunk and internal organs being supplied by other 

 branches on its way down. Now in this course it does 

 seem that the blood supply to the right side through 

 the larger conjoined vessel the arteria innominata does 

 receive a more direct current and the two vessels being 

 united and a little better positioned to receive the more 

 direct current, than on the left side where the two 

 vessels common carotid and subclavian are separate in 

 their origin, and given off at an angle not quite so 

 favourable to the supply in directness. 



In the supply to the lower extremities by the two 

 common iliac vessels, the right iliac seems to get a little 

 more direct supply than the left, not from difference in 

 blood pressure in either case ; for it has been found that 

 there is no difference in the pressure on the two sides, 

 as indeed, the physical law that liquids press equally 

 in all directions would preclude a difference in pressure, 

 but simply in direction, and the difference in direction 

 being more easy for the current is the only difference, 

 but with the multiplication of 120 beats a minute, the 

 rate of pulse of the newly born and before birth, would 

 make a multiplication of the slight difference of 

 120 per minute. 

 60 



7,200 per hour. 

 24 



28800 

 14400 



172,800 per 24 hours, 

 and that continued for a few years would easily establish 



1 Dr. Janeway, Blood Pressure. 



