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Where at one time professionals viewed disability as a condition inherent in a person, there now is widespread acceptance that, in large measure, disability is a social construct with roots in societal attitudes. Specifically, the case has been made by disabled people that they are the victims of discrimination. This paper reviews some of the empirical evidence of discriminatory practices in the areas of: access to education; meaningful participation in the labor force; and, physical and sexual assault. There is ample evidence of discriminatory practices in education and employment which further disadvantage disabled people. Disabled people receive less education and are much less likely to find a job than are non-disabled people and are much more vulnerable than the non-disabled to sexual or physical assault. Promoting and protecting the rights and dignity of disabled people will require a combination of legal approaches, attention to the concrete realities of disability and societal barriers, and changes in the perception of and societal attitudes towards disabled people.

1. Effect of aeration on hatching -In order to obtain a large yield of miracidia from fecal material, it was necessary to dilute the feces with water until a large quantity of the putrescible material had been eliminated from the eggs. It was further noted that, whereas hatching usually began within an hour and a half after the eggs had been washed at temperatures ranging from 25? to 31? C. and continued for several hours, after that time few miracidia appeared although a number of eggs contained motile larvae. Renewed hatching could be established under such conditions by the simple expedient of siphoning off the supernatant water and replacing it with a fresh supply. When a bicycle pump was used to aerate the supernatant liquid, which was returned to the flask in which the sediment was retained, there was a prompt emergence of miracidia after none had appeared for several hours. A stream of pure oxygen from a tank bubbled through the water containing ova resulted in the appearance of miracidia after their production had ceased and when the fecal suspension had become very foul. 2. Effect of temperature on hatching.-In the preliminary experiments it was observed that washed eggs could be kept in the icebox at 18? C. for as long as nine days without deleterious effects and without the larvae emerging. They readily hatched in the laboratory at temperatures ranging from 25? to 31? C. but at higher temperatures hatching was definitely interfered with. The following experiments were performed. The soft stool of a patient suffering from schistosomiasis was diluted approximately twenty times with raw, filtered indigenous water and poured through a 40-mesh screen. The sediment was collected and washed three times with large quantities of water and an equal quantity of the final sediment was placed in each of two 50-ml. volumetric flasks. These flasks were filled with rain water and one was placed at 29? C. (air temperature) and the other in a water bath at 37? C. The next day at 8 AM miracidia were noted in the neck of the flask which had been kept at 29? C. but none was present in the other flask. In the first flask miracidia continued to appear until 2 PM. The next morning there were no miracidia in either