Thomas Birch (1705-66), Secretary of the Royal Society from 1752 to 1765, and Philip Yorke, second Earl of Hardwicke (1720-90), wrote a 'Weekly Letter' from 1741 to 1766, an unpublished correspondence of 680 letters now housed in the British Library (Additional Mss 35396-400). The article examines the dimensions and purposes of this correspondence, an important conduit of information for the in...

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Introduction.?About eighteen months ago, we (Napier and Sen, 1940) published a preliminary paper on the treatment of kala-azar by 4 : 4'-diamidino stilbene. At the time our paper was sent to press, there were in the literature? that had arrived in this country?only two detailed reports on cases treated by this drug (Adams and Yorke, 1939; and Adler and Rachmilewitz, 1939). Since then a small sp...

In this paper, we distinguish three groups of definition of chaos: • the Devaney’s type of chaos: we will introduce three definitions which are equivalent on Baire Hausdorff spaces with countable base, before noting a defect in Devaney’s definition, leading us to give a new definition of chaos. We will also examine how the functor “Stone-Čech compactification” preserves and reflects chaos. • th...

Analyses and investigations on river flow behavior are major issues in design, operation and studies related to water engineering. Thus, recently the application of chaos theory and new techniques, such as chaos theory, has been considered in hydrology and water resources due to relevant innovations and ability. This paper compares the performance of chaos theory with Anfis model and discusses ...