with great facility all of the simple questions likely to occur in the
every day business of common life.

Undoubtedly Pestalozzi first conceived the idea of the true "inductive
method" of teaching numbers; but it was Mr. Colburn who adapted it to
the needs of the children of the common elementary schools. It has
wrought a great change in teaching, and placed Warren Colburn on the
roll as one of the educational benefactors of his age.

He died at Lowell, Mass., Sept. 13, 1883, at the age of 90
years.--_Journal of Education_.

* * * * *




THURY'S DYNAMO-ELECTRIC MACHINE.


Thury's dynamo-electric machine, which presents some peculiarities,
has never to our knowledge been employed outside of Sweden and a few
neighboring regions; but this is doubtless due to some personal motive
or other of its constructors, since it has, it would seem, given
excellent results in every application that has been made of it. It is
represented in perspective in Fig. 1, and in longitudinal section and
elevation in Figs. 2 and 3.

As may be seen, it is a multipolar (6-pole) machine in which an attempt
has been made to utilize magnetically, as far as possible, all the iron