2(J0 Agkicultukal Expekimknt Station, Ithaca, N. Y. 



between these houses the lamp was hung, and the arc was six 

 feet above the nearest glass. The lamp was hung in front of a 

 large, blackened sheet-iron screen, which, in connection with the 

 partition in the house and a series of curtains, completely excluded 

 the light from the compartment behind the lamp. By moving 

 the screen to the other side of the lamp and rearranging the 

 curtains, we were able to throw all the light into the other coms- 

 partment; this change was made during the experiment. The 

 lamp is the same pattern as that used the previous winter — a 

 ten ampere fortj-live volt 2,000 nominal candle-power, Westing- 

 house alternating current lamp. The lamp was attached to an 

 ordinary street lighting system, and it seldom bui-ned after H 

 o'clock, while it often ran but an hour or two, and on moonlight 

 nights not at ail. The lighted house was exposed to sunlight 

 during the day, and in addition received this small and varying 

 amount of electric light. The other or .so-called dark house was 

 lighted by sun during the day" and received no light at night. The 

 lamp carried a clear glass globe, so that the light passed thi'ough 

 two panes of glass — the globe and the roof — before reaching 

 the plants. 



The upper house — comprising the compartments A and B — 

 is what we term a cool-house, and it was used tor lettuce, endive, 

 radishes, beets, spinage, cauliilower, violets and daisies. This is 

 the house in which the experiments were mostly conducted, from 

 the fact that the two compartments of the other houses have 

 uidike roofs and are therefore not comparable. These houses. A, 

 B, ai*e the ones which were used in the experiments reported last 

 year. Lettuce was grown on benches 1, '6 and 4; radishes upon 

 the same, mostly between lettuce plants; beets upon 2,; cauli- 

 flowers upon 6; and the other plants upon 2. Bench A'o. 1 

 is not shown in the iUusti-ation. The lowei' houiies, (J 1), were 

 used for tomatoes, cucumbers and beans; and as i shall not refer 

 to those houses again, it may here be said that 1 was unable to 

 detect any influence whatever of the light upon these three plants. 



Lettuce. — Our main crop was lettuce, for in previous experi- 

 ments we had found a decidedly beneficial influence of the light 

 upon it. This benefit was fully as apparent this year. There 



