FOOTNOTES:
[1] Wells, ’17.
[2] Bury, ’20.
[3] This holds good, naturally, for any given spot on the earth’s crust: once the contained fossils have been carefully examined from a number of series of strata, they enable us to correlate the ages of the members of the different series.
[4] Bateson, ’22.
[5] There is a certain school of biologists who object to describing Protozoa as cells. This to others appears pedantic. But, whether or no they are right in the matter of terminology, the fact which I am here emphasizing remains, viz., that Protozoa had to be aggregated before the Metazoa, or many-celled animals, could arise.
[6] See Lloyd Morgan, ’20; Washburn, ’13; Köhler, ’21.
[7] Huxley, ’12.
[8] See Babcock and Clausen, ’19.
[9] See Conklin, ’22.
[10] See Carr-Saunders, ’22.
[11] See Huxley, ’12.
[12] See Woodward, ’98; Osborn, ’10.
[13] See Carr-Saunders, ’22.
[14] See Köhler, ’21.
[15] See Whetham, ’21; Castle, ’12.
[16] See the second essay of this volume for fuller discussion of this point.
[17] Inge, ’20.