"Their wonderful and admirable fitness for their own most necessary part in the economy of the hive must, therefore, be inherited from parents who have never been exposed to those conditions to which the workers are adapted; and this adaptation can not be due to the inheritance of the effect of these conditions, nor can we believe that they are inherited from some remote time, when the workers were perfect females or when the queens were also workers; for the sterile workers of allied species differ among themselves, thus proving that they have undergone modification since they became sterile. "Here we have a most complicated and perfect adjustment of marvelous efficacy to external conditions which are of such a character as to prove that the inheritance of the effect of these conditions has had no part in the production of the adaptation." His views of bird migration, based on the matter of ovulation and not on food supply, are extremely interesting. He says: "As their eggs are very large and heavy, a high birth rate is incompatible with flight, and the preservation of each species imperatively demands that every egg shall be cared for with increasing solicitude; for while in other animals increased danger to eggs or young may be met and compensated by an increase in the birth rate, the birth rate of birds can not be much increased without a corresponding restriction of the power of flight. Every one knows how quickly birds may be exterminated by the destruction of their eggs or young, and the low birth rate of all birds of powerful flight is a sufficient reason for migration, for at the same time that their fitness for flight limits the birth rate, it permits them to seek nesting places beyond the reach of their enemies." His critical estimate of Huxley is tersely presented. He says: "His evolution is not a system of philosophy, but part of the system of science. It deals with history--with the phenomenal world--and not with the question what may or may not lie behind it. "The cultivation of natural science in this historical field and the discovery that the present order of living things, including conscious, thinking, ethical man, has followed after an older and simpler state of Nature, is not 'philosophy' but science. It involves no more belief in the teachings of any system of philosophy than does the knowledge that we are the children of our parents and the parents of our children; but it is what Huxley means by 'evolution.'" Dr. Brooks credits Galton with employing simple terms to express new and abstruse truths, and we trust those who are continually wrestling with the dead languages to pick out new and distracting words to express their conceptions will profit by Galton's method.