Descartes expressed the singular opinion that “joy was the first passion of the soul, since it is not credible that the soul should have been placed in the body, except when the latter was well disposed; hence the natural result would be joy.” Others, following theoretic views less strange in character, maintain that, pleasure having for its cause the free play of our activity, pain is connected with the arrest of pleasure, and hence is posterior to it.[59] The majority of writers appear to me to favour the contrary hypothesis; the impressions of cold, of contact, the beginning of pulmonary respiration, etc., are cited as proving the priority of pain; still more so, the cries of infants and of the new-born young of animals. Yet Preyer, in two passages which have not excited much remark, refuses all significance to the cry, and sees in it nothing but a reflex action.[60] It does not seem doubtful that psychic life, in its first or intra-uterine and earlier extra-uterine phases may almost be reduced to a series of pleasurable and painful impressions. Do they resemble those of the adult? It is probable that they do; but it must not be forgotten that to assimilate the plastic forms of the primitive epoch to the fixed and rigid ones of adult life is a mode of reasoning conducive to numerous errors. Footnote 59: For the historical summary, see Bouillier, _op. cit._, chap. xii. Footnote 60: "The first cry of the new-born infant was formerly considered anything rather than a reflex action. It is, however, very probable that this first vocal manifestation, accompanying an expiration, is a reflex pure and simple. Kant wrote (without, indeed, having himself observed new-born children or animals): ‘The cry uttered by the child just after birth has not the intonation of fear, but that of irritation or anger. It is not because it is suffering, but because something displeases it. No doubt it would like to move and feels its impotence, as it might feel a chain restricting its liberty. What could have been the object of Nature in making the infant born into the world utter cries which are in the highest degree dangerous? Yet no animal save man announces its existence, at the time of birth, by similar cries.’ "This remarkable conception has been much commented on, and widely adopted. At the present time many people still think that the crying of new-born infants has considerable psychic significance. But all comments of this kind are met by the objection that a totally anencephalous infant cries at birth, and that many healthy infants do not cry, but sneeze, on their entry into the world, as noted by Darwin....