Chemistry and Physics. 145 



lliition is set up whirli the author terms binodal fie finds 

 these fundamental undulations in an infinitely deep circular 

 ^v\ are isoohronoua ^vith those of a pendulum whose length is 

 il to the radius of the vessel, and that the pendulum and water 

 > tou^'ther throughout their entire paths. This was sliown 

 eruuentally by a short pendulum with a heavy adjustable bob, 

 iIl^• a card-board sector attached to its upper end. A silk 

 ■ad attached to the edge of this sector carries a small parathn 

 , which rests at the center of the surface of the water con- 

 ('«1 in the cylindrical vessel. The length of the pendulum is 

 re<l until the motion of the disk is isochronous with that of the 

 "r. Two other forms of motion may also be produced by 



, an! I;y rocking the vessel. Kach has its own period, the last 

 tation of the 

 ith their formation. 



lowest. They may be sU])erposed 



igular troughs binoilal and 



i former by raising and lowering 



arface, and the latter by tilting the vessel. Ex- 



a itendnlum whose length is 2 divided by tt times that of the 

 trough. The i)rincipal questions still to be considered are: (1) 

 Why are the motions pendidar V (2) How is it that in circular 

 binodal motion the times are identical with that of a i)endulum 

 of given length? and (3) What is the mathematical connection 

 between the individual motion )f each particle and that of the 



I liquid wave is nuide to traverse an elastic tube. The cli 

 shape of the tube are measured at six points by small < 

 )irs connected with a chronograph so that the iorm 

 nd its time of transit past each point, are represented i 



formed 



(•:is(> of the hlood the aorta does no 

 m one artery to another. Its owi 



artcriis where they arc gradually 1 

 ir it ab-()rl)s and extincruishes 1 



rin/s., iv, 25. 

 [KD Skuie^, Vol. XI, No. 62.- Feb.. 1876. 



