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The article discusses the highlights of the summer meeting on freshwater ecology at Exeter held by the British Ecological Society on July 3-7, 1964. It was held at the University of Exeter in Devon, England, by invitation of Professor L. A. Harvey and the university authorities. H. Gruffydd's paper entitled "The Population Biology of Chaetogaster limnaei" pointed out there were morphological and behavioral differences between a form of Chaetogaster limnaei living in the kidney of Lymnaea pereger and a form living on the outer surface of this snail.

The article discusses the highlights of a meeting of the Tropical Group held in the rooms of the Linnean Society in London, England, on November 4, 1964. The meeting discussed the pattern in dry tropical vegetation. Papers presented are "Pattern in Acacia-Capparis Semi-Desert Scrub in the Sudan," by P. Greig-Smith, "Termites and their Influence on Vegetation in the Drier Areas of Africa," by W. V. Harris, and "Vegetation Arcs in Somalia," by C. A. H. Hodge.

The article presents a preliminary study about some of the chemical features of a peat profile. The study analyzed samples taken from a peat profile on the Leven estuary in North Lancashire, England. These samples were examined for their conductivity, redox potential, ash-alkalinity, calcium content, and iron content. Some of the elements and chemical properties in the exchange of a peat profile and the relationship between the variations in these properties and the vegetational composition of the peats are discussed.

The article reports on the recolonization at the upper margin of the sublittoral region of a part of Wembury Bay, South Devon, England. The research showed that the upward-facing sublittoral rock surfaces were populated by a forest of large brown seaweed, such as Saccorhiza bulbosa, Laminaria Cloustoni, Laminaria digitata, and Himanthalia lorea. No changes were seen in the motile fauna in this area, which could correlate with the changes in the algal vegetation. The author concludes that sessile organisms, which finally were established, eliminated their predecessors by occupying all the space available for anchorage.