Hidrológiai Közlöny 1949 (29. évfolyam)

3-4. szám - Kivonatok

their emerging blocks show traces of characteristie denudation in the Middle-Miocene proved hy traces of Teredo in the above named mountains. At Harkány, Siklós and Kistapoloa hot springs spout bes'de the Mesosoic remnant rocks. Hot springs ol' Siklós Castle were probahly known to the Tur.ks already. Mineralo-petrographical Analysis of Maros River Sand. By V- Pákozdy, T. Ungár and F. P. Váradi(Hungárián text with figs and tables on p. 84.) U. D. C. 592.517.4 [282.243.742.1] : 552.12 Analyzed samples were taken at about 600 steps from the discharge of the river (sketch). It has been found that the grading of detritus is determined besides the difference of level of the confluent rivers, Tisza and Maros, by tihe difference of velocity of the two eurrents. As regards grain size the average sample is coarse sand, more than 70 p. cent. lies between the ranges of 0.5 and 0.1 mm (figs. 1—2). Examination of roundness has shown that the degree of wear oí particles increases witih their dianieter (fig. 3). The relative amount of light and dark and of light and heavy mineral constituents as well as spécific gravities of the individual fractioms have been determined (figs. 4—6). In contrast to findings of American authors it has been found that the relative amount of heavy minerals does not increase with decreasing grain size according to a linear law, but attains a maximum between the ranges of 0.1 and 0.2 mm in the analyzed samiples. Of dark constituents of the Maros Kiver sand the following have been described: apatité, gold, biotite (fig. 7), disten, epidoit. garnet, hypertsten. dassiterite, inagnetite, olivin rutil, stanrolith, turmaliu and zircon (fig. 8). Report on the Tenth International Congress of Limnology. Switzerland, August 18—24, 1948. By 0. Sebestyén, D. Se- Tihany. (Hungárián text on p. 95.) U. D. C. 577.472 [281 : 061.3 [100] The exceedingly suocessful Congress was attended by nearly 200 members, representing 23 eountries. President: G. Huber-Pestalozzi, Vice-presidents: Professor O. Jaag and Dr. U. Corti. The change occuring in lakes throughout the continent due to industrialization and increase in population was the chief STibject of discussion. Polhition affecting the biologioal condition of fresh water bodies is followed by a lack of O

a in the water deptli and rnay lead to the destructlon of fish. A satisfactory solution of the problem requires thorougli scientific investigatiion. Reoent development and the present biological condition of the lakes on the borders ol' the Alps was considered in the addresses given by Professor Jaag (Switzerland), Professor Baldi (Italy) and Professor Ruttner (Austria). The eutrophization of stich lakes eauses mucii alarm in Switzerland. The plienomenon has not appeared as yet in Italy, whero the originál oligotrophy of several of the great lakes in maintained by ruorphometrical properties. In Austria the limnologist has made considerable sueces in investigating suoh problems as the relation of temperature to stalbility, opbical climate and meromictical condition. Taxonomical and ecological problems and those concerning the cultivation of Coregonus were discussed in the addresses given by Professor Steinmann (Aarau) and Professor Willer (Hamburg). Tte groundwaters were the subject of Dr. J. Hug's fcalk. There were nearly 90 other reports given on various sbudies, covering the fields of generál and applied limnology, to be publisihed '.n the Proceedings. Excursions were made to various great lakes (Zürich, Iieman, Vierwaldstatter), to the lakes near Laké Zürich and to the river Rhine. Several limnological institutions were visited (Fishery, Stafa; Hydrobiologioal Institute, Kastanieubaum; Purification plants, I/uzern, etc.). Ali the aetivities of the Congress reflected the great progress limnology has made during the past deeade, in a generál sense as well as by gaining more appreeiiation from the generál public. G. Alm was re-elected to the presidency of the Assooiation, 11-'. Rodhe became secretary and treasurer. The next Congress will take place in Belgium, in 1951. Parasitological Notes. III. By 1- Jaczó, D. Sc. (Hungárián text with figs. and tahle on p. 100.) U. D. C. 576.89 [28] + 576.895.121Í102 Three minor subjects are dealt with under the above title. In the first of theni the iunportance of the examination of parasites In limnological researeh into biocönosis is pointed out, because espeeially morbiferous parasites can exert rapid and vast infiuence upon the quality as well as the quantity of the members ol" the biocönosis. In the second part the first Hungárián occurrence of the cestoda-larva Vilepis unilateralis (Rudolphi) (Pigs. 1—3) in the gallbladder of the Balaton pike (Esox lucius) and the Tisza silure (Silurus gtanis) is pointed out. In the tliird part the parasitic Trematoda-larva, Diplostomum cuticola (Figs. 5—6) found in Blicca björkna (Fig. 4) caught in Ilake Balaton is presented. This parasite has hitherto been known to be present in Hungary in Danube fish only. What, can we expect from our newer medicinái springs from a medical point of view. By Ö- Schúlhof, M. D. (Hungárián text on p. 103.) U. D. C. 015.838 : 551.495/497 [439.1] During the last decades deep borings in Hungary diseovered numerous mineral waters of medicinái value. By their mineral content those of Bükkszék, Sóshartyán, Mezőkövesd and Tiszakürt excell arnong thean. At Bükkszék water of 39.4« C. was found, with 27.7 g/kg mineral matter in solution, of these 7.85 g are sodium-ion and 16 g hydroearbonate ion. lodine, sulphur and free carbonio aeid are present in smaller amounts, The water of Sóshartyán is of 18° C, contains 19 g/kg substance in solution of which about 17 g are sodium chloride. Its iodlne content is 93.5 mg/kg and it ranks fourth among mineral waters of the worbl in this respect. The (2° C hot water of Mezőkövesd with 3.4 g/kg solid matter in solution is of sodium-liydrocarbonateearthy-caloareous character and is remarkable for its content of sulphide-sulphur amounting to 15.4 mg/kg. In the water of Tiszakürt there are 26.3 g/kg of mineral matter in solution. This is the hottest mineral spring ín Hungary, having a temperature of 96° C. Most of the dissolved matter is sodium chloride. The iodine content is 7.78 mg/kg and its content oí metaboric acid is remarkable, being 647 mg/kg. The estaJblishment of national health resorts is planned at these places. The paiper still presents mineral waters of Békés of 41.2° C, of Csokonyavisonta of 76° C, of Erzsébet Salt Bath, Budapest, of 49° C, of Karcag of 54° C and of Komló of 54.8° C. These mineral waters are oí local importance for the regions coneerned. .121