688 Report on the Trials of Imj)lements at Reading. 
confessed that tbey were rather in doubt about the proper time 
for beginning and leaving off the artificial cooling of stacks ; 
they admitted that they had much to learn on this point, but 
the ingenious inventor of this thermometer decided the question 
for himself, and offered the public what they dearly love — be it 
right or wrong — a positive dogmatic opinion. It has yet to 
be proved whether these prescriptions will bear the test of 
experience. 
Although the thermometers, which were in the lower part of 
the stack, did not indicate a temperature exceeding 150^, it was 
evident to observers, from the smell and appearance of the 
stack, that some part of it was getting too hot for safety. The 
roof settled down and required re-making before the stack could 
be thatched. 
On the 1st of August, the Assistant-Steward, who had been 
left in charge of the field, thought it necessary to intervene. 
The temperature at the level of the eaves was 200°, and firing- 
point, according to Mr. Greening, was within a measurable 
distance. Mr. Box, writing on the 2nd of August, said, "Yester- 
day morning I found it necessary to take Greening's stack half- 
way down to get at the mischief, and this was above the top of 
the shaft ; upon this the fan had no power ; the hay had settled 
down, and with the settlement had broken the woodwork. I 
give you a section of the rick (Fig. 10). The hay over the 
top of the shaft had become hard and thick with mould, and 
Fig. 10. — Section of StacJc operated upon hy the Fan " One and All " 
exhibited by the Agricultural and Horticultural Association. 
A. — Thermometer 2 feet above the top of tlie sluift registered 200° F., after 
having been inserted one hour. 
B— Thermometer alxiut 120° F. c— Thermometer about 110° F. 
