Microscopical Essays. 



559 



146, Leucophra Conlhclor. 



Leucophra fphaerica, fubopaca, interaneis mobilibus. Sphe- 

 rical opake leucophra, with moveable interlines. 



This animalculum, or rather a heap of anhnalcula, is perfectly 

 fpheriqal, and larger than moil fpecies of the vorticella ; it is femi- 

 tranfparent, of a yellow colour, the edges of a dark colour. It 

 is filled with a number of the raoft minute molecules, it rolls at 

 intervals, from right to left, but fel dom removes from the fpot 

 where it is firft found. 



The innumerable molecules circumfcribed within this fphere 

 are in continual motion-, and, as it were, in vehement conflict, 

 without any order. From the great concourfe of combatants on 

 one fide, or the other, the fphere is turned either to the right 

 or left, the molecules going in the fame direction ; it is then tran- 

 quil for a fliort time, but foon the conflict becomes more violent, 

 and the fphere is moved towards the other fide, and continues to 

 move in a fpiral line. When the water begins to fail, they affume 

 an oblong, oval, or a cylindric figure ; the hind-part of fome is 

 compreffed into a triangular fhape, and the tranfparent part ef- 

 caping as it were from the interlines, which continue to move 

 with the fame violence till the water fails, when the molecules 

 are fpread into an uninformed mafs. But this alfo foon vanifhes, 

 when they fhoot into the form of the cryftals of fal ammoniac, 

 as defcribed by Baker, p. 3, No„.g, 



147. Leu 1 - 



