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This account deals with the four common species of triclad found living together in the shallow littoral zone of lakes in Britain, namely, Polycelis nigra (O. F. Muller), P. tenuis Ijima, DugesiaExpand
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Planetary Contamination I: The Problem and the Agreements
On the contents page of the 24 March issue, the title of the first article should read "Planetary Contamination I: The Problem and the Agreements: N. H. Horowitz, R. P. Sharp, R. W. Davies."
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Planetary Contamination I: The Problem and the Agreements
The sterility requirements for landed spacecraft tentatively adopted in the COSPAR resolution of 1964 are so severe as to pose a major obstacle to planetary exploration. This by itself would notExpand
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Education and Democracy
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Roman Cumbria and the African Connection
One of the niost iinpressive inscriptions froiii Roman Cumbria is a dedication-slab, now built into a farmhouse at Clifton, near Penrith. ' The inscription, now unfortunately badly weathered, wasExpand
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Book Reviews
MOSHE ABERBACH and DAVID ABERBACH. The Roman–Jewish Wars and Hebrew Cultural Nationalism. New York: Palgrave, 2000. Pp. xix, 170. $65.00 (us). Reviewed by Louis H. Feldman. MOSHE ABERBACH and DAVIDExpand
Summation and critique
A brief history of gravitational theory studies is presented. A discussion of the papers given at the conference follows. Possibilities for further study are noted.
The emergence of the Soviet economic system 1927-34
Reports and commentaries
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