P. 94. CONTAGION OF PHTHISIS.--See Dr. William A. Hammond's _Treatise on Hygiene_, p. 438, for air-space required by a healthy person. The contagion of phthisis is maintained by many authorities--among others, Dr. W. W. Gerbard (see Pennsylvanian Hospital Reports for 1868, p. 266). Professor Castan has recently collected, in the _Montpelier Médicale_, a variety of facts, which seem to show that tuberculosis may be communicated from a diseased to a healthy person by transpiration, breathed air, and living together (_Press and Circular_, March 10, 1869). In regard to the inoculation of tubercle, we have reference to the well-known experiments of M. Villemin, of the Hôpital Val-de-Grace, Paris. In this connection we may record an instance of recent medical heroism. M. Lespiaud, attached to the surgical department of the Val-de-Grace, in presence of several of his colleagues, extracted granular matter from the body of a phthisical subject, and introduced it under his own integument. This zealous investigator into the etiology of tuberculosis has thus exposed himself in a courageous way for the benefit of science, to the effects of a most dangerous and merciless disease. P. 96. THE DIGNITY AND PROPRIETY OF THE SEXUAL INSTINCT.--Dr. Edward John Tilt is the medical writer referred to (see _Uterine Therapeutics_, pp. 95, 313). See also Bosquet, _Noveau Tableau de l'Amour Conjugal_, vol. ii. p. 2, etc.; Rousel, _Système Physique et Moral de la Femme_, p. 211; Menville, _Histoire Médicale et Philosophique de la Femme_, vol. i. p. 36 et seq.; Raciborski, _De la Puberté_, etc., p. 45. P. 99. ON THE INDULGENCE AND RESTRAINT OF SEXUAL DESIRE.--Menville, vol. ii. p. 91; Bosquet, vol. ii. p. 280; _Economy of Life--or, Food, Repose, and Love_, by George Miles. Dr. Edward Smith, in his valuable work on _Cyclical Changes in Health and Disease_, has collected extensive statistics showing the effect of the time of conception on the viability of the fœtus. The quotation is from Carpenter's _Human Physiology_, p. 753. P 103. See _Lancet_ for March 6, 1869, p. 337, for report of discussion in the Pathological Society of London upon the physical degeneracy resulting from procreation during intoxication. Authorities could be cited at length upon this subject, but it is not necessary. See Huleland's _Art of Prolonging Life_, p. 207. Pp. 106-114. STERILITY.--For statistics referred to, see Dr. Matthews Duncan, _Fecundity, Fertility, and Sterility_ (Edinburgh, 1866), p. 181 _et seq._; Dr. Tilt, _Uterine Therapeutics_, p. 291; Dr. Edward Reich, _Gesundheitslehre des Ehelichen Lebens_, Th. ii.