![]() The chemical composition and biological properties of coconut (Cocos nucifera L.) water. Specific conductance values are expressed as "micromhos, K x 10 at 25° C." Silica, calcium, magnesium, sodium The mean discharge for the composite period is reported in second-feet. For some streams that are subject to sudden large changes in chemical composition, composite samples were made for shorter periods on the basis of the concentration of dissolved solids as indicated by measurement of specific conductance of the daily samples. ![]() Monthly composites were made at a few stations where variation in daily conductance was small. Three composite samples were usually prepared each month by mixing together equal quantities of daily samples collected for the 1st to the 10th, from the 11th to the 20th, and during the remainder of the month. Most of the analyses were made of 10-day composites of daily samples collected for a year at each sampling point. Samples for chemical analysis were collected daily at or near points on streams where gaging stations are maintained for measurement of discharge. These reports may be obtained from the Texas Board of Water Engineers and Geological Survey at Austin, Texas. Avrett " Chemical Composition of Texas Surface Waters, 1948," by B. Irelan " Chemical Composition of Texas Surface Waters, 1947," by B. Rowley " Chemical Composition of Texas Surface Waters, 1946," by W. Quality of water records for previous years can be found in the following reports: " Chemical Composition of Texas Surface Waters, 1938-1945," by W. Sampled were collected less frequently during the year at many other points. During the water year 25 daily sampling stations were maintained by the Geological Survey. The samples for which data are given were collected between Octoand September 30, 1949. This report is the fifth the a series of publications by the Texas Board of Water Engineers giving chemical analyses of the surface waters in the State of Texas. Buchanan.Chemical composition of Texas surface waters, 1949 John M'Arthur, Robert Lennox, Thomas Barbour, W. Dittmar is scrupulously careful in acknowledging, are Messrs. The gentlemen who assisted in the research, and whose services Prof. ![]() Dittmar's custom of having all the routine determinations made by assistants under his immediate supervision, while he devoted himself specially to the invention and trial of new methods and the repetition of doubtful experiments. The rapid completion of the work is in great measure due to Prof. Taken altogether, the Report reads like the account of a life-work, and it is wonderful how the immense amount of work described in it could possibly be accomplished in the six years which have elapsed since the return of the Expedition. It contains a detailed account of seventy-seven complete analyses of sea water, largely accomplished by the use of new and specially invented methods, the record of several independent researches into purely theoretical matters, and a number of exhaustive experimental criticisms of methods employed in similar work by other chemists. ALTHOUGH ostensibly a report on the composition of ocean water, this memoir includes in its 250 large quarto pages the record of a far more extensive research than the title implies. ![]()
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