Mon'tdina.'] infusoria ANisiAT.rrr.Es. 123 



they appear of a whitish hue. They are active, and feed on animal 

 as well as fungoid substances. They are found in water wherein 

 ajiimal matter is held in solution, but as the decomposition of the 

 animal matter proceeds, the animalcules die, and their bodies may 

 be seen rising to the surface of the Avater, and forming a thick and 

 colourless gelatinous stratum. Group 1, in the engraving is magnified 

 800 diameters. They rarely attain to I- 12,00th of an inch in 

 diameter, and never exceed it. 



MoxAS termo (M). Tlie end or limit Monad, so named from its 

 having been supposed to be the limit of animal organization. Active, 

 herbivorous, found in stagnant water, and increases rapidly where 

 there is an abundance of vegetable matter undergoing decomposition. 

 Size 1 -6000th, although some are not one half or even a third of 

 that measui'ement. 



M. guttula (M). The drop Monad. — Inactive. May be preserved 

 by drying. Twelve stomach-cells may be seen by the aid of indigo 

 or carmine. Surface appears granulated. Found in vessels of water 

 containing jilauts or flowers. Size 1 -2300th, or less. 



M. fivipara. The riviparous Monad. — Inactive. Found in stag- 

 nant water (**), coloured. Size, I -620th, or less. 



M. grandis. — The great Monad is of a greenish colour except near 

 the mouth. Proboscis short, l-3rd or l-4th the length of the body. 

 It is sluggish. Found in marsh water, very rare. Size 1 -430th. 



M. hicolor. The Two-coloured Monad. — Colourless, excepting one 

 or two green spots -wdthin it ; attenuated anteriorly. Motion vacil- 

 lating. Size l-1440th. 



M. ochracea. The ochre-eolonred Monas. — Yellow-ochre colour. 

 Found in water-eoui-scs. Size 1 -6000th at most. 



M, erubescens. The pale-red Monad. — Rose-coloured, and with a 

 slow but continual motion. Found in salt water. Size 1-1 728th. 



M. vinosa. The wine Monad. — Colour of red wine. Tremulous 

 motion. Eejeets coloured food. Found in vegetable infusions- 

 Size from l-12,000th to l-6000th. 



{h). 0ml or Egg-sha2)ed Monads — all colourless. 



M. kolpoda. — Vacillating motion. Discovered in water in the silver 

 mines of Siberia, Size 1- 7200th. 



K 2 



