1. N-pyridyltoluidine-containing fungicidal water dispersible granule which comprises 3-chloro-N-(3-chloro-5-trifluoromethyl-2-pyridyl)-$g(a), $g(a), $g(a)-trifluoro-2,6-dinitro-p-toluidine as a fungicidal active component, a surfactant and a carrier, and of which a 1 % water suspension is acescent.

Un granulé fongicide, dispersable dans l'eau et contenant N-pyridyltoluidine, comprend 3-chloro-N-(3-chloro-5-trifluorométhyle-2-pyridyle)-$g(a), $g(a), $g(a)-trifluoro-2,6-dinitro-p-toluidine en guise de composant fongicide actif, un agent tensioactif et un vecteur.

2. This study centers on the effects of acetylation, deacetylation, and sulphation on the staining of polysaccharides with Sudan black B in paraffin sections; it brings up the following facts: A definite staining of strongly acidic polysaccharides with alcoholic Sudan black B is obtained without any pretreatment of the sections. — After acetylation or sulphation, all the investigated polysaccharides exhibit a strong affinity to Sudan black B, alcian blue and toluidine blue; a distinct metachromasia is obtained with the third of these stains. — Any affinity of polysaccharides to the three dyestuffs is suppressed by deacetylation of the acetylated sections. — The most intense staining with Sudan black B is given by old or acetified solutions. — These data are consistent with the hypothesis according to which Sudan black B is provided with some characteristics of a basic stain.

1° Une affinité nette pour le noir Soudan B en solution alcoolique existe, dans le cas des polysaccharides très acides, sans aucun prétraitement des coupes. 2° Tous les polysaccharides présentent, après acétylation ou estérification sulfurique, une forte affinité pour le noir Soudan B, le bleu alcian et le bleu de toluidine; la teinte est souvent métachromatique avec ce dernier colorant. 3° L'affinité des polysaccharides pour les trois colorants disparaît après saponification des coupes acétylées.