PETERS. — METABOLISM AND DIVISION IN PROTOZOA. 479 



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

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

 a series of observations corresponding to the above with the following 

 result : 



4.27 4.31 4.38 4.47 



23°.35 23°.30 23°.15 23°.00 



10.6+ 10.6+ 10.65 (.7?) 10.65 



Variations = +60 minutes. 

 Variations = -0°.30 C. 

 Variations = 0.1 divisious. 



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

 would result in a larger value than 0.1 scale-division. Although it is 

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

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

 with a temperature change 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. 



I will record 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 following results: 



Time, 3.35 3.50 3.56 4.05 4.18 4.28 



Temp., 21°.50 21°.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., 2T.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. wafer containing the Stentors. 1 have however 

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

 number of Stentors employed. 



