Bui. 1465, U. S. Dept. of Agriculture 
Plate 5 
Completed Cover Equipment for the Growth of the Plant 
At the right rear is the water pipe with vent cap In the center the lamp chimney, tied with 
cord to the remnants of the handle, covers the hole at the center through which a sterile 
potato plant is appearing. The cotton plug of the chimney is covered with a paper cap, 
tiedpn. In the left foreground the hexagonal opening, sealed with tape and varnish, is to 
be seen 
