eir characteristics, even making goniometrical measurements
of their crystals.

Bunsen founded no school of chemistry; that is to say, no body of chemical
doctrine is associated with his name. Indeed, he took little or no part in
discussions of points of theory, and, although he was conversant with the
trend of the chemical thought of his day, he preferred to spend his
energies in the collection of experimental data. One fact, he used to say,
properly proved is worth all the theories that can be invented. But as a
teacher of chemistry he was almost without rival, and his success is
sufficiently attested by the scores of pupils who flocked from every part
of the globe to study under him, and by the number of those pupils who
afterwards made their mark in the chemical world. The secret of this
success lay largely in the fact that he never delegated his work to
assistants, but was constantly present with his pupils in the laboratory,
assisting each with personal direction and advice. He was also one of the
first to appreciate the value of practical work to the student, and he
instituted a regular practical course at Marburg so far back as 1840.
Though alive to the importance of applied science, he considered truth
alone to be the end of scientific research, and the example he set his
pupils was one of single-hearted devotion to the advancement of knowledge.

See Sir Henry Roscoe's "Bunsen Memorial Lecture," _Trans. Chem. Soc._,
1900, which is reprinted (in German) with other obituary notices in an
edition of Bunsen's collected works published by Ostwald and Bodenstein in
3 vols. at Leipzig in 1904.

BUNTER, the name applied by English geologists to the lower stage or
subdivision of the Triassic rocks in the United Kingdom. The name has been
adapted from the German _Buntsandstein, Der bunte Sandstein_, for it was in
Germany that this continental type of Triassic deposit was first carefully
studied. In France, the Bunter is known as the _Gres bigarre_. In northern
and central Germany, in the Harz, Thuringia and Hesse, the Bunter is
usually conformable with the underlying Permian formation; in the
south-west and west, however, it transgresses on to older rocks, on to Coal
Measures near Saarbruck, and upon the crystalline schists of Odenwald and
the Black Forest.

The German subdivisions of the Bunter are as follows:--(1) _Upper
Buntsandstein_, or _Roet_, mottled red and green marls and clays with
occasional beds of shale,