One of the features which, from the standpoint of society, may have an unfortunate result is the mixture of races in the family life. While this has not taken place to such an extent in the country districts as it has in the towns, nevertheless, a great many families in Porto Rico are composed of mixed races. The biological tendency in cases of mixed races, according to most authorities, is a decrease in the number of children in the family as generation succeeds generation, unless there is an addition of new blood to a considerable extent. This may possibly be one of the means which Nature has provided for solving the problem of overpopulation in Porto Rico, but there is the added fact that usually as the succeeding generations become fewer in regard to numbers, they also become less capable mentally and physically. The race question in Porto Rico will undoubtedly come to be one of the problems that has to be solved, and it will be more difficult of solution than the race problem in the United States, where the races are becoming more widely separated every year and where it is very infrequent to find persons of the two races in the same family. In Porto Rico the problem will be intensified because it is not merely a problem between races, but a race problem which involves the family organization in many cases. The government of Brazil has predicted that in a hundred years there will be no black inhabitants in the Brazilian republic, that they will be entirely assimilated by the white race or carried off by disease. The census report for Porto Rico shows a falling off in the black race of about 9,000 in the last ten years, and an increase of about 30,000 in the mixed or mulatto population. Thus the assimilation of the black population is gradually taking place, and whether this will in time lead to a complete assimilation, or whether the mixed race will become weakened through this racial intermarriage to such an extent that it will eventually refuse to propagate, is a question which only time can answer. There is no doubt, however, that this is one of the problems that must be confronted in Porto Rico. RURAL HOUSING CONDITIONS THE housing of a people is always a matter of prime importance in their social life and development. There is little progress until the housing conditions are comfortable and hygienic, and the development of the home and the family life depends to a great extent on the conditions under which a people lives. The housing conditions in Porto Rico, especially for the poorer classes, are far from satisfactory. The dwellings of the country people are described as follows, in the Report on the Housing Conditions in Porto Rico, published by the Insular Bureau of Labor in 1914: