with the middle distance
fairly open, and snow broken up--also, when strong contrasts appear in the
view between the snow and other objects--then a longer exposure is
needed--from one-tenth to a full second, according to the light. Use No. 8
stop.

This class of pictures should be developed in a weak solution. A suitable
metal hydroquinone developer is made as follows: Metal, thirty grains;
hydroquinone, thirty grains; twenty ounces of water. Then add sulphide of
soda (crystals) one ounce, and carbonate of soda (crystals) three-quarter
ounce.

Take two ounces of this, and add four ounces of water when there are no
very heavy masses of dark in the foreground, and eight ounces of water
when there are such masses. Before using, add one drop of ten per cent
solution of potassium bromide to each ounce of the solution.

Class 3 embraces snow pictures with figures, street scenes, skating and
sleighing scenes, etc. Short exposure is required here because of the
motion of the figures. The correction must be made in development.

The development of plates of this kind where there are dark objects and
brightly lighted snow or ice in the view is practically the same as in No.
2.

TIME IN WHICH MONEY WILL DOUBLE AT SEVERAL RATES OF INTEREST.

+------- +--------------+--------------+--------+--------------+--------------+
|Rate of | Simple | Compound |Rate of | Simple | Compound |
| Int. | Interest. | Interest. | Int. | Interest. | Interest. |
| | | | | | |
+------- +--------------+--------------+--------+--------------+--------------+
| 1% | 100 years. | 69 years and | 5% | 20 years. | 14 years and |
| | | 245 days. | | | 75 days. |
| | | | | | |
| 2% | 50 years. | 35 years. | 6% | 16 years and | 11 years and |
| | | | | 243 days. | 327 days. |
| | | | | | |
| 21/2% | 40 years. | 28 years and | 7% | 14 years and | 10 years and |
| | | 26 days. | | 104 days. | 89 days. |
| | | | | | |
| 3% | 33 years and | 23 years and | 8% | 1