Dr Wolff employs purifiers in which the gas is washed with water containing calcium chloride, and then passed through bleaching-powder solution or other oxidizing material.
Dr P. Wolff has found that when this is used on the large scale there is a risk of the ammonia present in the acetylene forming traces of chloride of nitrogen in the purifying-boxes, and as this is a compound which detonates with considerable local force, it occasionally gives rise to explosions in the purifying apparatus.
Metamorphosis.It has already been pointed out that each kind of member of the body may present a variety of forms. For example, a stem may be a tree-trunk, or a twining stem, or a tendril, or a thorn, or a creeping rhizome, or a tuber; a leaf may be a green foliage-leaf, or a scale protecting a bud, or a tendril, or a pitcher, or a floral leaf, either sepal, petal, stamen or carpel (sporophyll); a root may be a fibrous root, or a swollen tap-root like that of the beet or the turnip. All these various forms are organs discharging some special function, and are examples of what Wolff called modification, and Goethe metamorphosis.
His brother, Siegmund Jacob Baumgarten (1706-1 7 57), was professor of theology at Halle, and applied the methods of Wolff to theology.
The System der Logik (1828) of Bachmann (a Kantian logician of distinction) contains a historical survey (pp. 569-644), as does the Denklehre (1822) of van Calker (allied in thought to Fries), pp. 12 sqq.; Eberstein's Geschichte der Logik and Metaphysik bei den Deutschen von Leibniz bis auf gegenwartige Zeit (latest edition, 1 799) is still of importance in regard to logicians of the school of Wolff and the origines of Kant's logical thought.
Of the numerous bridges, the most remarkable are the Schloss-briicke, built after designs by Schinkel in 1822-1824, with eight colossal figures of white marble, representing ideal stages in a warrior's life, the work of Drake, Albert Wolff and other eminent sculptors; the Kurfiirstenor Lange-briicke, built 1692-1695, and restored in 1895, with an equestrian statue of the great elector, and the Kaiser-Wilhelm-briicke (1886-1889) connecting the Lustgarten with the Kaiser-Wilhelm-strasse in the inner town.
For at the basis of Herbart's speculation there lies a conception of identity foreign to the thought of Kant with his stress on synthesis, in his thoroughgoing metaphysical use of which Herbart goes back not merely to Wolff but to Leibnitz.
But this phylogenetic differentiation of the organs was not what Wolff and Goethe had in mind; what they contemplated was an ontogenetic change, and there is abundant evidence that such changes actually occur.
This point of view was further developed in the following century by Caspar Friedrich Wolff (Theorici generationis, 1759), who first followed the development of the members at the growing-point of the stem.
There is a monograph on Baldwin by Wolff (Konig Baldwin I.