66 
maintained, and in which the highest temperature should not ex- 
ceed 432°, the fraction coming through the correction of the ther- 
mometer, degree by degree, with a standard. The maize seed from 
the same ears as heretofore used was put in the apparatus at 2 P. M. 
Feb. 9, with a temperature of 432°, and continued until 7 A. M. 
Feb. 19, when an accident to the apparatus occurred and the tem- 
perature rose to 47.2°. The seeds were at once examined, and ger- 
minations had occurred with the dents alone, yet the acrospire had 
almost broken through the pellicle in some of the pops, less so in the 
flints, and no marked change in the sweets other than the softening 
and swelling which comes from the absorption of water. 
EXPERIMENT IV. 
The thermometer readings during this trial, when noted, read as 
below, whereby it is seen that as at no one time the temperature 
exceeded 432°, the temperature of germination for dent corn must 
be below this point. | 
Feb. a Feb. Feb, Feb. Feb. Feb. Feb. Feb. Feb. Feb. 
Hours. 9. 11.00 12. dB) M4 Deer) ek 19. 
7A. M. 43° 43°R «-43°3 48° 48° «48°4 4893 41°3 48° 472° 
8 se ce 434 4<é sé ce ce sé 424 “é 
9 “é 43 433 “6 ce “6 o¢ 43% 43 «6 
10 a3 +6 433 a 6“ 66 “6 434 66 ce 
11 73 “é 43+ 46 ca) 423 “ce 6 ce ¢ 
123 noon 43% 66 66 66 43 (a3 a 66 “ce 
1 P M. 43+ 46 434 (6 ce “é ce a3 ce 
9 “c 43°3 45 sé 6s «6 “sé ae «¢ ims «ce 
3 a3 66 66 (a3 434 sé 43+ ve 66 (73 434 
4 “ce (6 ce ce 66 “é es té sé 4c 43 
5 oe ‘6 “e cc 43 ce 432 ve (eé “se se 
6 «6 “é ce 6 “6 431 “e ce cs é «é 
7 oe cc “ec ‘6 66 3 oe (¢ 43 “ec “cc 
8 ae ce 4é ‘< 46 43 ce «6 e “ec “e 
9 oe “6 (7 “6 cs 46 (6 a3 6é «s 6é 
10 ce oe 43+ 43 ce “e “6 ae a6 “e ce 
‘ih as “se “6 434 ae ie a3 “é “ec ia9 “ec 
12 sé ce cs 46 66 ce ee «6 cs “é 4e 
We note that the range of temperature is very small, on Feb. 17 
the clock work ran down too far, but the outlets were closed and no 
harm was done as the temperature was descending; on Feb. 19, the 
same accident occurred, but the ventilators were left open and the 
temperature ascended, thus bringing the trialto anend. Assuming, 
as is perfectly legitimate, that the observed temperatures are an in- 
dex for the unobserved hours, we have 168 hours out of 233 hours in 
which the following temperatures were recorded :— 
Assumed. 
Hourly No. Duration of temp. , 
of observa- for whole period. ” 
Degrees. tions noted. Hours. 
414 1 
424 AES he rete saver Awe ree ler 4 
422 l 
43 68 : 171 
434 cet a ie eB Aa TSS 
434 TAQ Meds ® oa 0s Beas 58 
432 sce pia 
168 233 

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