Page 87: added missing closing parenthesis "(and that too of such a _Density_ to make them continue _shining_)" Page 90: "necesary" changed to "necessary" (Boyle also made many experiments to show that air was necessary for the life of animals ...) Page 93: changed "thermo-couple" to "thermocouple" (using a thermocouple as the measuring instrument) Page 94: "_D_" changed to "_B_" (placed in a large Dewar flask (_B_) filled with water) Page 97: "thermo-couple" changed to "thermocouple" (Readings of each thermocouple on the galvanometer scale ...) Page 94: "Thermo-couples" changed to "Thermocouples" (Thermocouples (_L_ and _M_) of advance...) Page 100: changed "McKenny" to "McKenney" (McKenney (1902) found also ...) Page 102: changed "misceable" to "miscible" (insoluble in water but miscible with it) Page 103: "demontrate" changed to "demonstrate" (I have been unable to demonstrate their existence in luminous bacteria;) Page 104: "thermolable" changed to "thermolabile" ( ...and a thermolabile complement (_alexin_) are necessary.) Page 104: "thermolable" changed to "thermolabile" (Because of the necessity of thermostable and thermolabile substances for light production ...) Page 105: "thermolable" changed to "thermolabile" (luciferase (=_photogenin_) for the thermolabile material ...) Page 111: "preslence and H_{2}O_{3}" changed to "presence of H_{2}O_{2}" (_lophin_ could be oxidized by vertebrate blood in the presence of H_{2}O_{2}.) Page 116: "or" changed to "of" ( ... and would disappear from solution in the course of a day or so.) Page 116: changed "oxidizible" to "oxidizable" (The luciferins, as the oxidizable substances, must claim first attention.) Page 123: "contrated" changed to "concentrated" (1 c.c. portions of concentrated luciferin) Page 132: "coluciferase" changed to "co-luciferase" (He now regards it as identical with his co-luciferase) Page 151, Table 13: corrected duplicate numbering "10" to "11" (11 Ferric chloride) Page 151, Table 13: corrected duplicate numbering "14" to "15" (15 Chromic sulfate) Page 151, Table 13: abbreviated "minute" to "min." in two entries (boiled 1 min. and filtered) Page 158: changed "appear" to "appears" (... and yet light appears only in presence of the latter.) Page 162: added missing closing punctuation (More complete works on light and luminescence come first and original articles follow.) Page 165: added missing comma (DUBOIS, R.: 1918a, Sur la Synthèse de la Luciferine.) Page 165: changed "Biophotogénesis" to "Biophotogénèse" (Recherches Recentes de M. Newton Harvey sur la Biophotogénèse) Page 165: changed "Biophotogénèsis" to "Biophotogénèse" (Nouvelles Recherches sur la Biophotogénèse) Page 166: changed "Oxydations geschwindigkeit" to "Oxydationsgeschwindigkeit" (Ueber die Oxydationsgeschwindigkeit von Phosphor ...)