98 BOTANICAL GAZETTE [FEBRUARY 
From these figures and from the previous determinations of the 
average number of calories required to raise each set of apparatus 
one degree in temperature, I calculated the number of calories 
required to raise 75 gr. of air-dry peas 1°. These figures and the 
average follow: 
To raise 1° requires: 
I=45.70 cal aa arenes B no. pi perites required ve raise 1—1°—11.62= 34.08¢ 
2= 49.38 2—1°—13.25=36.13¢ 
3=47.78 79 ce ce “ “ ce “ “ 3-1 °— 12.81 = 34. g7c 
4= 46.80 ce zg cc cc ic9 “ “ce “ 4—1°—13.49=33.31C 
Se ee ees ebiges . = 6 5—1°— 11.67 = 38.79C 
a 8 G Sa aiaee eee ae aie - «6 —1°— 10.54 = 33-73C 
ea eee ernst eae oi, SEE ONE 
celal - singe 7 , gr. ‘ade dey Re oe ae 
gr % ee oe oy yeas -. One 
From this it appears that it takes 0.468 of a calory to raise one 
gram of air-dry peas 1° in temperature. A repetition of the experi- 
ment with the same apparatus and under similar conditions gave 
an average of 0.457 of a calory per gram of air-dry peas. 
The same experiment was repeated on a later date with this 
modification; 6 lots of air-dry peas weighing 75 gr. each were put 
in the same 6 Dewar flasks and washed in a concentrated aqueous 
solution of mercuric bichloride. After rinsing twice with boiled 
distilled water, the peas were coveréd with 100 cc. of boiled dis- 
tilled water in each flask, thermometers and cotton plugs were 
inserted as usual, and the whole allowed to stand for 24 hours in the 
laboratory. The temperatures in the flasks and in acne room at the 
hours stated were as follow: 
MARCH I0, 1909 
FLASK 
12:00 M. 2:00 P.M. 
Re Ga ea ce ke Reweae te 16.0° Room 18° 16.55° | Room 20.5 
Caer ISL algae ee eae ardour arar a gear vn irene Hie Cee ear 16.40 1a ee 
Be oe rei yy cece UE 2 Bkcties alt rare eae $90 vee wen? 
ONE yh BOERS Bee EEE ad aOR GI ae O50 fy ute ce $7.90 © [enc een pees 
ee iis See Mba ees SFG e i Ee) BB.10 | wocuee ners 
gy ee ies ta es co eRe arene, “Tmt ar 18.05 | erga 
