THE ANALYST. APPARATUS. Apparatus for the Valuation of Manganese Peroxide. M. Nothomb. (Chenz. Zed., 1898, xxii., 80.)-This apparatus may either be used for the purpose indicated or for the estimation of carbon dioxide. I t is comparatively small, and when fully charged weighs only about 80 gramines. The glass stopper of the flask serves also as a stopcock, opening or closing communication between R and R1 according as it is revolved in the neck of the flask. The latter contains a small quantity of dilute sulphuric acid, but not enough to touch the perforated receptacle carried by the tube E. Into the acid is put a weighed amount of manganese peroxide, and a few crystals of oxalic acid are laid in the basket. The stopper is then inserted in such a position that R and R1 are not connected, strong sulphuric acid is poured into the bulb to the height shown, and the whole weighed.Connection is next made between R and R1 till the oxalic acid is covered with liquid; and when the reaction has ceased, dry air is blown in through E to drive out the carbon dioxide. 111 The lower part of the tube F1 inside the bulb is of course not joined to R, as inight be imagined from the illustration given herewith. F. H. L. A New Measuring Pipet,te. 0. Bleier. (Chenz. .&it., 1898, xxii., 59.)-With reference to the illustration of his pipette on p. 55 of this volume, the author notes that for convenience sake the distance between each bulb should be a trifle greater112 THE ANALYST, than there shown-in fact, that each constriction should be a short tube-as other- wise, although the capacity of the apparatus between each graduation may easily be determined, it will probably work out to some uneven number of cc.s, thus depriving the pipette of much of its practical simplicity.A modified form of the arrangement, which will be found very useful, especially for measuring large volumes of water, as in diluting liquids or making up standard solutions, may be prepared by constructing the bulbs of different sizes. For instance, the graduated portion a--b may contain 25 C.C. ; b-c, 25 C.C. ; c-d, 50 C.C. ; d-e 100 C.C. ; e-f, 200 C.C. ; so that by suitable manipulation any quantity of water can be measured with perfect accuracy. In this manner the use of graduated flasks, which are of necessity marked high up in the neck, can be avoided ; and a standard solution may be prepared in a much larger vessel by weighing the solid, calculating the proper amount of water, and adding it by means of the measuring burette, when, as the vessel need only be halE full, the liquid can be shaken satisfactorily till solution is effected.F. H. L. A Convenient Filter - stand. H. Faber. (Chem. Zeit., 1898, xxii., 39.)-The construction of this stand is sufliciently explained by the dia- gram. The tables A and B are either fastened rigidly together so that they revolve simultaneously on the ver- tical axis C, or B may be carried by a shoulder on the socket rising from A, in order that by the insertior of a suitable number of washers under- neath B, the distance between the two tables may be adjusted to suit diflerent sized funnels and beakers. F. H. L. An Improved As- bestos Filter. A. Goske. (Chenz. Zeit., 1898, xxii,, 12.)-The object of this improvement is to reduce the amount of asbestos necessary to ensure efficient filtration, so that while the filtrate is perfectly clear, yet the operation is not unduly prolonged. As will be seen in the accompanying cut, the hollow glass ball has two small holes in its upper part. It is covered with a layer of dry asbestos fibre about 5 mm. thick, then connected with the pump, and a sufficient quantity of asbestos powder previously suspended ,in water is poured over it in the same way as is done in preparing a Gooc!i crucible. F. H. L.