134 



PRACTICAL MICROSCOPY. 



which the collector may have with him. A word of advice 

 to the student : Do not overcrowd the organisms, and do 

 not leave any portion of the bottle or tube filled with air 



if they are to be exposed to 

 shaking or concussion. On 

 arriving home the contents of 

 the tubes may be emptied into 

 small aquaria improvised from 

 broken wine glasses, or better 

 perhaps the tube can be stuck 

 through the centre of a large 

 cork and floated in a vessel 

 of water to maintain an equal 

 temperature, when the organ- 

 isms can be easily abstracted as 

 required by means of a dipping 

 tube. 



Amongst the Infusoria the 

 Eiiglena viridis, Paramecium 

 aurelia, and Coleps hirtus are 

 good objects for study ; of the 

 Rotatoria, A nurcsa longispina 

 has been found in the tap water 

 furnished by the Birmingham 

 corporation, and others are to be 

 met with in the same habitat, 

 notably Triarthra longiseta and 

 Salpina redunca. 



Melicerta ringens, the tube- 

 building rotifer (Fig. 120) is a 

 beautiful object, and should be carefully searched for ; it is 

 frequently found attached to water plants, such as the 

 Potamogeton crispus, or large-leaved pond-weed; the Ana- 

 charis alsinastrum and Myriophyllum spicatum. 



FIG. 1 20. 



