The periodate - Schiff reaction has been used to localize polysaccharides in frozen-dried specimens of several genera of the Endomycetales, of which three representatives are here described. No PAS reactive cell wall component was detectable in Schizosaccharomyces, in contrast to the distinctly reactive cell wall layer in Nadsonia, Saccharomycodes and Saccharomyces. These findings are in agreement with independent data from electron diffraction studies and analytical chemistry of these genera. These, and other observations suggest possibilities of phylogenetic research with the electron microscope in conjunction with cytochemical methods for comparative submicroscopic localization of cell wall polysaccharides and the study of morphological detail during budding or other types of cell division.The structure of starch, the vacuole and its contents, and vesicular nuclei are described briefly.Basophile staining of Nadsonia, in particular, disclosed bodies tentatively identified as mitochondria pending cytochemical localization of characterizing enzymes. These structures possessed internal lamellations, seen as negative images, seemingly corresponding to typical osmiophilic cristae. Dense, basophile particles measuring about 60 A, hitherto not described in the mitochondrial literature, occurred in the spaces between the lamellations.Die Peroxydase-Aktivität in der Milch nicht-trächtiger Kühe unterliegt periodisch bedingten Schwankungen, die bei trächtigen Tieren nicht auftreten. Diese Schwankungen stehen in zeitlichem Zusammenhang mit dem Brunstzyklus. Ähnlich wie die äußerlich feststellbaren Zeichen der Brunst, die individuell bedingt, stärker oder schwächer hervortreten, steigt auch die Aktivität der Peroxydase in Milch während der Brunst bei den einzelnen Tieren verschieden stark an. Diese Aktivitätserhöhung setzt sich über den Zeitpunkt der offensichtlichen Brunstdauer hinweg fort und sinkt erst nach stattgefundener Ovulation im Verlauf weniger Tage wieder auf den Normalwert zurück.
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