42 Transactions Tennessee Academy of Science. 



Fig. 2. Eight stages in the movcnicnl of an anieba ( Amoeba proteus 

 Leidy) drawn at intervals of abont half a minute. A particle of glass 

 was laid in the anieba's i)ath, 1. The ameba became a little uncertain in 

 its movement, 2. As the amel)a nioxed forward ]iast the glass, a small 

 pscudopod was thrown out din-ctly toward it, 4. This pseudopod i)ecame 

 the main i)seudoi)od through which the .ameba moved away o\-er the glass 

 without any further change in beh,i\ior incident to iIk' glass. Stage 4 

 illustrates the sensing of glass at a distance. Natural size of ameb.a. about 

 one quarler nun. in length. ilu' arrows indicate the dirt.'ction of mo\e- 

 mcnl of tin- proto])lasni. 



