This article presents evidence that, from selected spectroscopic articles in the earliest volumes of the Physical Review to other selected spectroscopic articles from the same journal in 1980, a shift in sentence style takes place. This shift is from what M.A.K. Halliday calls the dynamic style (which reflects happenings, processes, and actions)…

Examines the number of relative clauses and percentages of subordinate clauses in two sets of research reports from "Physical Review." Finds a slight decrease in percentages of relative clauses from the first set (1893-1901) to the second (1980). Finds striking differences in patterns of what relative clauses modify. Suggests a stylistic shift…

Concludes that readers recall syntactic subjects very poorly. Suggests that to understand more precisely how readers represent such subjects in memory, new and rich models of language and of possible domains in text will be needed. (FL)

Reports that social studies and science passages containing hedges (such as "perhaps" or "it is possible that") led to greater learning gains than did passages without hedges. Notes that hedges expressed in personal voice, in the second half of a passage, and in low intensity especially increased retention. (JAD)

Explores research relating parts of clauses to the communicative roles they play. Proposes that M. A. K. Halliday's system of analyzing sentences into one or more kinds of themes and a rheme is a useful system in conducting such research. Discusses implications of this system for understanding discourse production, structure, or reception. (RDS)

Presents a study of the grammatical subjects as used in scientific discourse. Provides evidence that the grammatical subjects in a sample of scientific discourse are markedly long. Identifies three pressures that operate on scientists to produce such markedly long grammatical subjects. (HB)