:l{) 



five inches per hour. It must be remarked, however, that all 

 the globules in the same cell do not progress at the same 

 rate : one will at times lag behind, till pushed forward by some 

 more rapid racer, or will itself push on, overtake, and pass 

 those before it. At times the nucleus will be passed most 

 unceremoniously, the globule going over or on one side of 

 it ; at another, it will be turned round on its axis by the 

 globule running under it ; but in passing the corners, it will, 

 as it were, revenge itself occasionally, by revolving round and 

 attacliing to itself all the globules within its reach. Occasion- 

 ally, but very rarely, a few of the globules will leave the 

 ordinary line of march, as if despatched on some important 

 business, will cut short across to the opposite side, and then 

 quietly fall in again, as if they had placed themselves under 

 orders ; sometimes the whole file will follow in their wake, 

 and in a few instances the original direction of the current, 

 if so it may be called, has been reversed. 



" The rapidity with winch the globules circulate, varies 

 exceedingly in different cells, no matter how great their conti- 

 guity ; and, what is more striking still, varies at opposite sides 

 of the same cell. When any cell, in which motion is about to 

 begin, is carefully watched, the circulation is seen to commence 

 by one or more globules passing slowly towards one or other 

 end, along the side of winch they soon begin to creep; others 

 join them in a few seconds ; and in less than three minutes a 

 circuit has been established. In the chara the circulation is 

 still more fitful than in the valisneria : the globules in its 

 cell will sometimes stop 'suddenly, whilst those that were till 

 then cpiiescent will break loose and move away ; sometimes 

 they will jostle each other, squeeze past their fellows, and go 

 quicker than them all ; others when arriving at some particular 

 point will spin away on their axis, each turning perhaps in a 

 different direction ; others again, when coming to the same 

 point, will drink less deeply of the inspiring draught, and 

 only jog on a little faster than before — others near the centre 



