1917] 
FREIBERG— MOSAIC DISEASES 201 
84° Е. The plants which showed apparent recovery at the 
low temperature grew vigorously and showed some mottling. 
A single potato plant which had contracted the disease was 
discovered in the greenhouse, and this was placed in the room 
METEOROLOGICAL SUMMARY FOR DECEMBER, 1916 
TEMPERATURE 
Degrees Fahrenheit) “үе зърна 
Е 5 5 8 2 a CHARAC- 
DAY & Еф Бо аа a © TER OF 
ев |898 | Ва |%в8 | 3 | Be] рлу 
ра: [5] i o i ната ы = 
жа [2 = 525 | S38 | жш 
= я к | ада чае | во Е оё 
„20 Е ч Св | oan © An SEs 5 54 
СЕЕ 2 24 - х НЕ 
1158 | 40 | 49 | +10 55 44 ‚00 9.6 | 100 | Clear 
2 | 60 | 41 | 50 | +12 62 52 T 8.0| 83 | Clear 
3 |68 | 49 | 58 | +20 78 74 ‚00 7.( Pt. cloudy 
4 | 71 | 58 | 64 | +26 $ 53 T: 6.6 | 69 | Pt. cloudy 
5 | 59 | 45 | 52 | +14 6 24 .00 6.8 | 71 | Clear 
6 | 57 | 39 | 48 | +10 4 x .00 (i 74 | Clear 
7 |69 | 50 | 60 | 4-2: ‹ E 0.0 0 | Cloudy 
8|: 29 | 44 | + 7 ) ) „ФЕ 0.0 0 | Cloudy 
9 24 | 31 | — 6 56 ‚00 9. 100 еаг 
ED 28 | 33 | — € 25 ИД LH 61 | Pt. cloudy 
36|24|30|— 6 ) 02 0. 0 oudy 
2 | 30 | 17 | 24 | —1: 4 T. 1. 11 loudy 
312017114 | —2: ) ‚00 ER 33 | Cloudy 
4 7|13| —2: 33 ‚07 0. 0 loudy 
261-2144 2: JY 56 Ti бү 66 | Pt. cloudy 
6 16 | 34 | — 72 ( 00 9.4 | 100 | Clear 
А 27 |32 | — 3 92 6 d 0.0 0 | Cloudy 
3130119 | 24 | —1 66 ( JT. 6.( 64 | Clear 
› | 40 | 2 32 | — 3 7 é .00 0.4 4 | Cloudy 
ES 1 19 94 ¢ ‚02 12% 20 Cloudy 
1 ) | —24] 84 5 04 0.0 Cloudy 
2 —22 79 ( .00 9.4 | 100 | Clear 
36 ; — 7 85 1 .01 6.: 69 | Cloudy 
4751-90.|-: +4 77 60 ЕТ. ae 76 | Pt. cloudy 
38 |: Е -- 2 82 ( .00 9.4 | 100 еаг 
15814 4 +14 98 98 1.06 0.0 0 loudy 
46 | 29 + 5 82 3 .00 6.1 65 | Pt. cloudy 
ШЕС ЕМЕ yj — 3 69 ) .00 9.4 | 100 ear 
Ж% 22 | — 7 63 у .00 9.4 | 100 | Clear 
30 | 34 | 22 -- 5 66 ) ‚00 9.5 | 100 | Clear 
31 | 40 | 24 0 69 ) 4 5а 6.9 73 Pt. cloudy 
kept at 85° F. At the end of 10 days nearly all mottling had 
disappeared, and the plant was then placed in the room kept 
at 45°. At the time of transfer, the sprouts which had been 
trailing on the ground were tied up. The leaves gradually 
