sed by night fishing but that
a number of fishermen were thereby released for national service during
the war. An interesting incident pertaining to fish, but perhaps not an
important factor in production, is the use of electric lights in the
summer over the reservoirs of a fish hatchery. These lights, which hang
low, attract myriads of bugs, many of which fall in the water and
furnish natural and inexpensive food for the fish.

Many experiments have been carried out in the forcing of plants by
means of artificial light. Some of these were conducted forty years ago,
when artificial light was more costly than at the present time. Of
course, it is well known that light is essential to plant life and in
general it is reasonable to believe that daylight is the most desirable
quality of light for plants. In greenhouses the forcing of plants is
desirable, owing to the restricted area for cultivation. It has been
established that some of the ultra-violet rays which are absorbed or not
transmitted by glass are harmful to growing plants. For this reason an
arc-lamp designed for forcing purposes should be equipped with a glass
globe. F. W. Rane reported in 1894 upon some experiments with electric
carbon-filament lamps in greenhouses in which satisfactory results were
obtained by using the artificial light several hours each night. Prof.
L. H. Bailey also conducted experiments with the arc-lamp and concluded
that there were beneficial results if the light was filtered through
clear glass. Without considering the details of the experiment, we find
some of Rane's conclusions of interest, especially when it is remembered
that the carbon-filament lamps used at that time were of very low
efficiency compared with the filament lamps at the present time. Some of
his conclusions were as follows:

The incandescent electric light has a marked effect upon
greenhouse plants.

The light appears to be beneficial to some plants grown for
foliage, such as lettuce. The lettuce was earlier, weighed more
and stood more erect.

Flowering plants blossomed earlier and continued to bloom
longer under the light. The light influences some plants, such
as spinach and endive, to quickly run to seed, which is
objectionable in forcing these plants for sale.

The stronger the candle-power the more marked the results,
other conditions being the same.

Most plants tended toward a taller growth und