-----------+-----------+---------------------------------- | _Arbacia_ | Temperature+-----------+-------------+_Strongylocentrotus_ | Loeb and | Loeb and | _purpuratus_ | Wasteneys | Chamberlain | | 1911 | 1915 | -----------+-----------+-------------+-------------------- °C. | _Minutes_ | _Minutes_ | _Minutes_ 3 | | | 532 4 | | | 469 5 | | | 352 6 | | | 275 7 | 498 | | 291 8 | 410 | 411 | 210 9 | 308 | 297.5 | 159 10 | 217 | 208 | 143 11 | 175 | 175 | 12 | 147 | 148 | 131 13 | | 129 | 14 | | 116 | 121 15 | 100 | 100 | 100 16 | 85.5 | | 17 | 70.5 | | 18 | 68 | 68 | 87 19 | | 65 | 78 20 | 56 | 56 | 75 21 | | 53.3 | 78 22 | 47 | 46 | 75 23 | | 45.5 | Upper temperature 24 | | 42 | limit 25 | 40 | 39.5 | 26 | 33.5 | | 27.5 | 34 | | 30 | 33 | | 31 | 37 | | -----------+-----------+-------------+-------------------- These figures permitted the determination of the temperature coefficients Q₁₀ with a sufficient degree of accuracy (see next table). It seemed of importance to attempt to decide what the chemical reaction underlying these reaction velocities is (if it is a chemical reaction). Loeb and Wasteneys[255] investigated the temperature coefficient for the rate of oxidations in the newly fertilized egg of _Arbacia_ and found that the temperature coefficient Q₁₀ for that process does not vary in the same way as the temperature coefficient for cell division. [255] _Loc. cit._ TABLE XI TEMPERATURE COEFFICIENTS Q₁₀ FOR THE RATE OF SEGMENTATION AND OXIDATIONS IN THE EGGS OF _Strongylocentrotus_ AND _Arbacia_