Reprinted from: Monthly Weather Review, Vo. 93, No. 7, Pp. 421 to 443, 1965 / The relationships between climatic factors and fluctuations in dated tree-ring widths are statistically evaluated. A wide ring indicates that the year's climate was moist and cool, and a narrow ring dry and warm. In general, ring width relates to a 14-month period from June through July but most tree-ring chronologies exhibit a closer relationship with autumn, winter, and spring moisture than with summer moisture. The climatic relationships for evergreen trees are attributed largely to the influence of environmental factors on photosynthesis and the accumulation of food reserves. Under abnormally dry and warm conditions, especially during the autumn, winter, and spring, little food is accumulated, new cells are formed more slowly during the growing period, and the resulting ring is narrow. Relative 10 -yr. departures are calculated for the entire length of 26 tree -ring chronologies from western North America. Those portions after 1500 are used to map areas of high and low moisture. Periods of widespread drought are noted in 1576-1590, 1626-1635, 1776-1785,1841-1850, 1871-1880, 1931-1940. Periods of widespread and above average moisture occurred during 1611-1625,1641-1650, 1741-1755, 1826-1840, 1906-1920. The moist periods of 1611-1625, and 1906-1920 were most widespread and markedly above average.

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No description available.

The thesis explores the practical, moral and intellectual forces shaping native policy making in North America. It is argued that white society is struggling with an unresolved dialectic between its economic desires and its political idealism and that this conflict is expressed in native policy making as a simultaneous affirmation and denial of aboriginal rights. This theme is traced comparatively through Canadian and American native policy making histories from 1763 to 1990, focusing on three major policy areas: Indian dispossession, Indian political incorporation and Indian economic integration.

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No description available.

No description available.

Life history aspects of the lentic caddisfly, Nectopsyche albida (Walker), were investigated in the field and laboratory using systematic observational and conventional collecting methods. A two cohort population could be recognized based on field collections of approx. 110,000 adults and 2000 larvae made during 1975-1976.Premating swarming is described and consists of "figure 8" display flights performed by males at dusk and dawn. Attracted females then enter the swarm and select a mate. Sperm transfer is completed via a spermatophore in mid-air.Selection of aquatic vascular plants with suprasurface shoots as an oviposition site is favored over areas of water lacking such cues. Hatching larvae disperse to the shallows to develop. Bylate autumn predominantly fifth-instar larvae remain and these return to the deeper waters of the pond to overwinter on the aquatic plant, Myriophyllum exalbescens Fernald. Only about 20% of these late instar larvae move to the shallows to pupate during late spring.New records of nematode (Mermithidae) and water mite (Pionidae) infestations of the adults are also reported.

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Graduation date: 1976