vysvětloval na schůzi pořádané Jednotou učitelskou "Komenský" pro Prahu a okolí dne 18. ledna 1902 František Tilšer., Text dopl. obr. jevu a bytu předmětů v prostoru a připojenou tabulkou soustavy písma kosmografického a podobiznou Isaaca Newtona (1642-1727)., KČSN., and Obsahuje bibl. odkazy a rejstřík
A unique geographic location of the Krkonoše Mts. during the glacial periods (in the forefront of the continental ice shield) together with relatively harsh climatic conditions of the summits during the Holocene, provide suitable conditions for the occurrence of many glacial relicts from different taxonomic groups. Glacial relicts show continuous distribution in taiga and tundra biomes, with isolated occurrences in montane and alpine belts in mountain ranges of the moderate climatic zone. The article provides an overview of glacial relicts in the Krkonoše Mts. and Jan Vaněk, Jan Materna, Jiří Flousek.
A tiny terrestrial snail Vertigo geyeri is an example of a typical late-glacial relict in the central Europe. It inhabits exclusively treeless fens and is highly endangered in most of its area and internationally protected. So far, only three recent and highly isolated populations have been found in the Czech Republic. The first one, a small calcareous spring fen located in the V Dubech Nature Monument was however damaged by construction of drainage canals and summer droughts in the last few years and the future survival of this population is doubtful. New sites found in 2011 (the Louky u Jeníkova NM and the Ratajské rybníky NM) document that the species is still extant in the Czech Republic at more sites than previously thought., Jan Myšák, Michal Horsák, Jaroslav Č. Hlaváč., and 4 barev. fot.