nce of both halves of the field. With a little
practice this may be overcome and the neutral point found, but when it
cannot, the ordinary telescope of the instrument may be replaced by
another, which is furnished with the polariscope and which carries a
yellow plate. This removes the difficulty and renders it possible,
even for one not well accustomed to the instrument, to set it at the
exact point of neutrality.

SUMMARIZED SOURCES OF ERROR.

The following principal sources of error must be especially guarded
against:

1. Drying out of sample during weighing.

2. Excess of subacetate of lead solution in clarification.

3. Incomplete mixing of solution after making up to mark.

4. Imperfect clarification or filtration.

5. Concentration of solution by evaporation during filtration.

6. Undue compression of the cover glass.

7. Alteration of the temperature of room, position of instrument, or
intensity of light while the observation or control observation is
being performed.

8. Performances of polarization with a cloudy, dim, or not completely
round or sharply defined field.

In closing this report the members of this commission hereby signify
their intention to promote uniformity and accuracy by adopting and
using the standards and general plan of procedure recommended in this
report in the polarimetric determinations over which, in their
respective branches of government work, they have control.

* * * * *

THE GRAND FALLS OF LABRADOR.

Hamilton Inlet, or Ionektoke, as the Esquimaus call it, is the outlet
to the largest river on the Labrador Peninsula, and of great
importance to commerce, Rigolet, the headquarters of the Hudson Bay
Company in this region, being situated on its shores. This inlet is
the great waterway to Central Labrador, extending into the interior
for nearly 200 miles.

This immense basin is undoubtedly of glacial origin, evidences of ice
erosion being plainly seen. It is divided into two general basins,
connected by the "narrows," a small strait, through which the water
rushes with frightful rapidity at each tide. Into the head of the
inlet flows the Hamilton, or Grand River, an exploration of which,
though attended with the greatest danger and privation, has enticed
many men to these barren shores. Perhaps the most successful
expedition thus far was that of Mr. Holme, an Englishman, who, in the
summer of 1888, went as far as Lake Waminik