Section 12. Appendix 2, The Relative Supplies from Town and Country Families to the Population of Future Generations, An Apparatus For Testing The Delicacy With Which Weights Can Be Discriminated By Handling Them, Whistles For Testing The Upper Limits Of Audible Sound In Different Individuals, Questions On Visualising And Other Allied Faculties
Listen "Section 12. Appendix 2, The Relative Supplies from Town and Country Families to the Population of Future Generations, An Apparatus For Testing The Delicacy With Which Weights Can Be Discriminated By Handling Them, Whistles For Testing The Upper Limits Of Audible Sound In Different Individuals, Questions On Visualising And Other Allied Faculties"