PETERS. — METABOLISM AND DIVISION IN PROTOZOA. 479 



I now placed in the same test-cell 3 cc. of very pure water containing 

 ten Stentors introduced by the process of multiple transference, and made 

 a series of observations corresponding to the above with the following 

 result : 



Time, 4.07 4.15 4.20 4.27 4.31 4.38 4.47 



Temp., 23°.30 23°.30 23°.35 23°.35 23°.30 23°. 15 23°.00 

 L., lO.G 10.6 10.6 10.6+ 10.6+ 10.65 (.7?) 10.65 



Time, 4.54 5.07 Variations = +60 minutes. 



Temp., 23°.00 23°. 00 Variations = -0°.30 C. 

 L., 10.7 10.7 Variations = 0.1 divisions. 



Since there was a decrease in temperature, a correction of L for this 

 would result in a lars^er value than 0.1 scale-division. Although it is 

 not important to my purpose to establish more than an appreciable value 

 for L, a rougli trial was made immediately with the same materials, but 

 with a temperature cliange of 2° C. This was equivalent to a change 

 of 0.5 scale-division. This correction applied would give a value to L 

 of about 0.17 scale-division. 



1 will recoi'd here one more similar experiment. The same thimble- 

 beaker with paraffined thermometer bulb and 3 cc. of pure water only, 

 gave the following readings for the control experiment : 



Time, 3.02 3.10 3.17 3.25 3.32 Variations = +.30 min. 

 Temp., 21°.75 21°.65 21°. .50 21°. 50 21°.50 Variations = -0°. 25 C. 

 L., 10.5 10.5 10.5 10.5 10.5 Variations = div. 



With ten Stentors added I obtained the followins: results : 



Time, 3.35 3.50 3.56 4.05 4.18 4.28 



Temp., 2r.50 2r.50 21°.50 21°.50 21°.50 21°.50 

 L., 10.5 10.5 10.5 10.5 10.5 10.6? 



Time, 4.35 Variations =: +60 mimutes. 



Temp., 21°.50 Variations = ±0° C. 



L., 10.6 Variations = +0.1 divisions. 



Experiments like the above two were often performed, but not always 

 with the care here exercised. The results uniformly showed an increase 

 in the conductivity/ of the water coiitaining the Stentors. I have however 

 learned to regard the above values of L as not being proportioned to the 

 number of Stentors employed. 



