RGA), PACK—JUNIPERUS 43 
The alternation of temperature between —23° and 10°C. kills 
moist Juniperus seeds very soon, and in no sense can be looked 
upon as a forcing agent. 
One lot of moist seeds was subjected to a temperature of 
—5° C., and a second lot to an alternating temperature of —5 and 
5°C. The latter was exposed to each temperature for one week 
TABLE IX 
EFFECT OF TEMPERATURE ON CATALASE ACTIVITY OF JUNIPER SEEDS (NO. 10) 
MATERIAL AND TREATMENT OQ; IN CC. LIBERATED DURING} TOTAL Loss OR 
reste eae Hae seg cis 
b ban ing Temperature °C. imin. | 5 min. | ro min. tory 
Condition 
Stored 45 days 
ipa peepee sage OTE | bw chin pe cee Re 2.6 5.4 | BAe. ewe 
|v 3 Sailer altel: 0.025 —33 2.5 5.4 5.7 —o.1 
Wo. 0.026 | —23 2.4 8.0 es —0.3 
OP eet 0.023 | —23 an aed +10* 2.2 4.9 5-4 —0.4 
i Ba re 0.026 | —23 and +10* 1.6 3.2 3.0: 2 
Me Ra 0.025 | — 3.0 ay 5.8 0.0 
MOG 0.025 3.0 6.0 6.5 | +0.7 
Wate 0.026 | — sand+ 5* | 3.5 | 6.8 7-0 +1.2 
we. 0.026 | + 5 4.61945 9.1 +3.3 
Mes ee. 0.026 | +10 35 6.6 7-0 +1.2 
jC a ee 0.026 | +25 3-0 6.2 6.9 +1.1 
Stored 95 days 
ee 0.023 | —23 2.3 sis 5.8 0.0 
Wet. | 0.023 | —23 2.4 §.1 5-7 —o.T 
Dry. . 0.026 | —23 and +10* 2.0 4.2 5-0 —0.8 
Wey oo: | 0.025 | —23 and +10* 1.0 2.8 = 7 —2.7 
we | 0.025 | — § 3.0 6.4 6.5 +0.7 
LL eae | 0.025 3-4 7-0 8.0 +2.2 
we... 0.026 | — sand + 5* 3.8 8.0 9.0 “362 
We. | 0.026] + 5 5.0 9.1 12.0 +6.2 
We ae. 0.026 | +10 3.9 8.2 9.2 +3-4 
we | 026 | +25 2.8 5.6 6.0 +0:2 
*Weekly alternated between the two temperatures. 
atatime. Table [IX shows the catalase activity of these seeds for 
45 and 95 days exposure. The lot stored at —5°C. showed 
scarcely any increase of catalase activity, while the lot exposed to 
the alternating temperature was more active. Both lots appeared 
morphologically and physiologically in good condition. There 
was a slight accumulation of sugar in all seeds. The first showed 
