Report on the Trials of Implements at Reading. 
688 
galvanised iron. These were laid in the same line, radiating 
E. and W. from the centre. Each was provided with a plug, so 
that either or both could be used or closed at pleasure. At 
right angles to these tubes were two others, which, however, 
did not extend so far inwards as the shaft ; they were inserted 
simply for the purpose of testing the temperature of the stack. 
A portable slow-combustion stove was used occasionally, and 
the only other alteration required was attention to the heat of 
the stack, and the opening or closing of the flues in order to 
regulate it. On the 23rd the temperature on the N. was 135% 
and on the S. 105° ; on the 24th the N. had risen to 144", on 
the 25th it had sunk to 130°, on the 26th to 118°, and on the 
27th to 110° ; on the 28th it rose again to 134°, and on the 29th 
it was 140°, and after some fluctuations 144° was reached on 
the 10th of August (see Table XV., p. 718), 
When the stack was cut, the light galvanised-iron cage had 
completely collapsed ; the water had run down by the side of 
the ventilating tube, and rotted the hay in places ; and the lower 
part of the stack was mouldy, while the upper part would have 
been of more value if it had been allowed to heat more. The 
grass of this field was much of it a sharp-edged sedge, and 
required heating to make it palatable to animals. 
Plot XIII. — C. D. Phillips. 3rd Stack. Haxd-potver Fax. 
The stack from this plot included the produce of about 
7 acres, much of it a light crop of sedgy hay, but a portion of 
the field was of better quality. The grass was cut on the 15th 
of July, and stacked on the 20th, in very fair order, but still 
green. In place of the wooden-box flue employed for his 
second stack, ^Ir. Phillips used here a sheet-iron tube 8 inches 
in diameter, as in his 1st and 4th stacks. The shaft was formed 
in the same way as before, bv drawing up a light cage, and 
removing it at about half the height of the stack. By the 23rd 
the temperature was N. 145°, E. 138°, S. 88°, VV. 75°. On the 
24th there was a slight decrease all round, but the fan was 
worked for half an hour, reducing the highest temperature from 
140° to 130°, and the lower temperature of the S. from 70° to GG°, 
while the W. remained 68°. On the day following, a rise of 
15° on the N. and of 18° on the S. occurred before 10*30 A.M., 
and a further rise of 16° (to 100°) was made on the S. in the 
course of the day, while the N. remained stationary. The fan 
was worked for one hour. On the morning of the 26th the 
temperature was very much equalised throughout, and the fan 
was worked for half an hour ; then, after a stoppage of about 
three hours, it was worked again for one hour. At the close of 
the day the average temperature had declined about 13°, but a 
