1910] Collins,— Corrugated Paper Boards in drying Plants 223 
stiff wire hoop sewed in at the lower edge. Under this an ordinary 
lamp with a single 3 inch wick was set on the floor and kept burning. 
This lamp heated the air confined under the press and inside the cloth, 
and drove it up through the grooves of the corrugated boards. "The 
lamp consumed less than one cent’s worth of oil in ten hours. 
This is a brief description of the simple “make-shift’’ press that 
first demonstrated the advantages mentioned above. Since return- 
ing home the writer has tried certain modifications which show that 
somewhat better specimens can be obtained, though not so quickly 
dried, if the press is built up as follows; a corrugated board, a regu- 
lation drier, a specimen sheet with the inclosed plant, a drier, a corru- 
gated board, and so on. Although the double-faced corrugated board 
(smooth on both surfaces) is better to handle, and can be used either 
side up, it appears doubtful at present if it has any particular advan- 
tages otherwise over the single-faced. 
Professors M. L. Fernald and K. M. Wiegand have been using 
corrugated boards with excellent results for the past two seasons to 
ventilate their field presses. These boards were at first placed an 
inch or more apart in the press which was otherwise handled in much 
the manner that is familiar to most of us; but during the past season 
they were employed as described in the last paragraph, except that 
one change of driers was made in order to straighten folded leaves, ete. 
As a result Messrs. Fernald and Wiegand found it possible, in an 
unusually damp atmosphere, to leave their presses unattended after 
the first change of driers and to make prolonged collecting trips 
without fear that the plants left in press would be injured. Mr. J. 
H. Emerton has recently been using a press, with good results, in 
which corrugated boards and cotton wadding are the most conspicu- 
ous features. During the past summer Dr. H. S. Conard used a 
press very similar to the one described above in connection with his 
work at Cold Spring Harbor, N. Y. He spoke very enthusiastically 
of its merits, and some of his suggestions have been adopted here. 
In all of these presses the one most important feature is the cheap 
and efficient ventilation furnished by the corrugated boards, thus 
allowing the easy and rapid dissipation of moisture, and at the same 
time precluding all danger of mildew or blackening under ordinary 
conditions. This statement also applies to presses used in foggy or 
humid regions. The nearer together in the press these ventilators 
are placed the more rapid will be the drying process, even if artificial 
