31.   A. The chemicals are one, copper sulphate, a potent poison, sold by chemical supply stores and some lumber stores.

32.   Agricultural chemicals are in hot demand both locally and in Brazil, a part of the trend in developing agribusiness and opening new lands to farming in both countries.

33.   But more data are needed to suggest that the chemicals may be a cause, Pribble said.

34.   But industrial chemicals may be a problem.

35.   But Potter said it is not clear yet if these free radical chemicals are the primary agents of these carcinogenic changes.

36.   But that chemical is one of the OPs under review.

37.   But the chemicals are not yet widely available, and they cost more and must be applied more often than other fungicides.

38.   But under the Food Quality Protection Act, she said, the burden of proof was with the manufacturers to show that the chemicals were safe.

39.   But, and for good reason, the chemicals were not an objective.

40.   But, he cautioned, people should be wary of assuming that the chemicals in question will be useful as a treatment.