This method is to be attempted that fusulinids specimens are observable by means of the impressions upon celluloid-membrane ("Sump-Figures") without making thin slices., The prosses is as follows., 1., Polish materials with a grinding machine and flatten the surfaces., 2., Immerse them in 2% Hydrochloric acid for 2-3 minites., 3., Polish the material with chromium oxide or red ochre on a woolen buff., 4., Etch them with 2% acetic acid for 1-2 minites., 5., Make impressions upon celluloid-membrane with a mil acetate.,
