Functional-adaptive features and palaeobiologic implications of the postcranial skeleton of the late Miocene sabretooth borhyaenoid Thylacosmilus atrox (Metatheria)

A functional-adaptive study of the postcranium of two late Miocene sabretooth borhyaenoid specimens (Mammalia, Metatheria) is presented. Thylacosmilus atrox developed a longer neck than in non-sabretooth borhyaenoids and was capable of strong flexion of the head. The lower back is well-stabilized and more rigid than in the other borhyaenoids. The forelimb appears well-suited for manipulating and capturing prey, with a probably well-developed deltoid and pectoral musculature. Compared with other Miocene borhyaenoids, the hip joint of Thylacosmilus is modified to allow greater postural flexibility (e.g. possibility of erect stances). The low greater femoral trochanter, the short and sigmoid tibia, and the semiplantigrade hind foot of Thylacosmilus precluded fast running. Thylacosmilus killed by stabbing, a peculiar mechanism that evolved in parallel in many other sabretooth taxa. This technique has significant functional-adaptive consequences on the postcranial skeleton, superimposed on the generalized morphological pattern reflected in its non-sabertooth relatives. The superficial similarities observed between Thylacosmilus and Smilodon overshadow real differences (at the level of joint patterns and muscular groups involved in particular movements), a condition that suggests the development in the marsupial form of a morphological type unique to the thylacosmilid lineage within Borhyaenoidea.     

A regional investigation of subadult dietary patterns and health in late Iron Age and Roman Dorset,England

This is the first regional analysis of the impact of Romanisation on subadult dietary patterns and related health parameters in Britain. A sample of 200 subadults from late Iron Age (LIA) and Romano-British (RB) Dorset were examined for dental health and specific metabolic diseases, and a sub-sample of 29 individuals were selected for nitrogen and carbon isotope analysis. The results showed that dental health declined in the Romano-British period and the incidence of scurvy and rickets rose. Increased consumption of marine foods in the RB period is indicated by an increase in δ¹³C between the LIA and RB subadults. After early childhood, there was no age-dependent variation in dietary protein in the RB and LIA populations from Dorset. We propose that these changes related to the introduction of urban living, Romanised diets and population migration.     

Representation in Congress and the Executive: Rethinking the Perspectives of James Madison

This article contributes to the development of a "revised" interpretation of James Madison's views on representation. I suggest that Madison's approach to representation is more complex than has been recognized. Specifically, Madison believed different "styles" of representation are necessary for the House, Senate, and President because of the unique functions served by each institution. "Style" refers both to the nature of the representative-constituency relationship (the "role" of the representative) and the character of the individual most likely to be selected as representative. In Madison's scheme, the proper functioning of each institution is guaranteed only if the method of selection insures the appropriate role is maintained and persons of proper character are selected. Throughout the essay, I note significant differences between the arguments which Madison put forward in the Constitutional Convention and those he defended in the Federalist essays.     

Party Leadership in the U.S. House of Representatives: Making Theoretical Sense of Ambition and Context

This article focuses on the policy-making activities of House Republicans in their early transition to power (104th Congress) as well as in their settling in (105th Congress). Key components of House governance, as practiced by the Democrats in the 103rd Congress, serve as a benchmark for comparison. The analysis reveals substantial differences between the size, scope, and thrust of the leaders' issue agendas. Over time, decision-making apparatus and strategies for building floor coalitions and publicizing party views vary as well. Using data from interviews with the principals and a host of sources from the government and the media, I find evidence that draws attention to the power of personal ambitions and political contexts.     

Electrical innovation: State initiative or private initiative? Observations on the 1881 Paris exhibition

The characteristics of the 1881 Paris Exhibition would seem to support Mensch's thesis: that it was the result of collective action backed by the State. But in fact, its history leads to quite a different definition of electrical innovation in the 1880's: The Exhibition was the result of an accurate perception of the needs of the existing technological system. It made entrepreneurs accept risk, and was based on an aggressive solicitation of the consumer.