In his view this is not the unhappy result of erroneous observation, but depends upon exact observation during a long series of years, and in conditions which brought him into intimate relationship with numbers of persons in all classes of society. Thus, after a long, difficult, and careful investigation into a =hundred= marriages among persons of different classes, he obtained the following results, here briefly summarized: Upper Classes. 1. The marriage not unhappy, wife suffering from disorder arousing suspicion of syphilis; conjugal fidelity of the husband prior to the occurrence of this illness doubtful. Children sickly. 2. Both parties to the marriage happy =in advanced age=, after the husband had lived freely. 3. Both parties happy =in advanced age=--childless. 4. Husband impotent, wife unhappy. 5. Husband an old man, wife =unfaithful=. 6. Husband and wife apparently happy--children scrofulous. 7. The husband removed from home by circumstances, wife unfaithful. 8. Both parties unhappy, the husband a libertine. 9. Both parties apparently content in advanced age. 10. Husband a dissolute old libertine, wife unhappy, but resigned--no children. 11. Condition precisely similar to No. 10. 12. A happy mésalliance. 13. The husband phlegmatically happy, wife dissolute, children ill, mother sickly. 14. Husband dissipated, wife resigned. Husband and wife have come to an understanding. 15. Husband a libertine, wife a Messalina. Both parties syphilitic. Children sickly. 16. Both parties unhealthy and miserable. Husband dissipated, coarse. Wife ill, in a decline. 17. Husband a coarse libertine, wife separated from him and unhappy. Upper-Middle Classes. 18. Both parties unhappy. Husband impotent. Wife, who is elderly, a Messalina. Marriage childless and unceasingly stormy. 19. Both parties tolerably happy, owing to gentleness and good-heartedness. Husband a sensualist and unfaithful. Wife faithful, ailing. 20. Both parties unhappy. Incessant domestic warfare in the house. 21. Phlegmatic rich husband, poor suffering wife--marriage childless--happily, as it seems. 22. Both parties in very advanced age, apparently happy. Their past doubtful. Scrofulous children. 23. Childless marriage between a former high-class mistress and a dissolute man. 24. An apparently happy marriage between a still young husband and an elderly wife. The former compensates himself secretly. 25. Unhappy marriage. Both parties unsatisfied. Husband dissolute. Wife resigned. 26. Happy marriage. 27. Doubtfully happy marriage. 28. Extremely unhappy marriage. Husband a libertine, unprincipled; wife half insane; children syphilitic. 29. Unhappy marriage, the husband formerly somewhat fickle, the wife unforgiving.