1910] SHATTUCK—HETEROSPORY IN MARSILIA 27 
temperature was a very important factor. I then grew the plants 
out of water for a week without applying the spray, and had no trouble 
with blasting. This process was repeated several times with the same 
TABLE II 
OPEN AIR TEMPERATURE READINGS TAKEN FROM 2:00 P.M. TO 3:00 P, M. 
1907 Weather | Open air a 15 ae Tank Dry soil | Wet soil 
Alunist gt... 54, cloudy Scars 20 23.5 ae 
August 22....... clear ak 23 eles 25 
Augea as... clear 2I 20 20 az.5 
August 24....... clear 2S 25 21.5 27 Sia 
August 25....... ear 24.5 27 20 28 35-5 31-5 
August 26....... cloudy 4 22.75 9 24 23 2 
August 27..:.:.. cloudy 22.5 2 20.5 24 24 23-5 
August 28.2... ear 24 26 27-25 29 8 
August 29....... oudy 20 21 19.25 | 2% : 
Auguat 372.0... cloudy 8.5 39-5 
ptember r..... r 93-5 30.75 2565 33-5 s 
September 14....| clear I 37 
Average readings |........ 24.38 | 24.37 | 225304. 20,00:] 26.161 28.0 
TABLE III 
GREENHOUSE TEMPERATURE READINGS TAKEN FROM 2:00 P. M. TO 3:00 P. M.* 
SouTH TANK —— 
1907 Weather Air {Wet soil) Surface Surface; Tap Jet Spray 
August 19.. clear 
“SOMA Creer 34 ives [3h ee 136 15-5 
PURO Bie cloudy | 28.5 Oe 
Se “te ) oe eee cloudy | 25> ad can Oa 
BURG 32. lear oe tere 3° 25 
POE Bk 26 ops 23 oven f+ 
ay, roach clear. | a ga. b4a O55 174 1 34 | BAS 
inne ie clear 27.75) 20.75) 20:5 | «++. | 98 25-5 | 21-5 
MU 908s. sc, cloudy | 29 27 27-25) 23.5 | 19-5 | 31 aS 
om ee cloudy | 25 i ae eo 18.75] 24 | 33 
ine, iene ay gE clear 30 a0.5 1 98° O68 19-5 | 3% 23-5 
Pct cy eee ae cloudy | 22 a2 | ar ae * 
Mae St cloudy | 33 33 3 28.5 | 19 35-5 
Ss peember bore ee clear 39.5 | 35.25) 34:5 7 S32 cc pads 26 
ptember 14........, clear 43.90)..... | 30 27 Pig - 
Average readings ..... 29.45| 29.93] 28.8 | 25.7 |19.22 | 30.8 | 24-5 
*It will be noted that this table of readings was taken in 1907. It is more complete than the one 
taken in 1905, but does not vaty materially from it, except in the columns marked jet and spray. These 
are higher in this table because the water was heated by means of the sun which shone on about 12™ of 
the pipe, raising the average reading for the jet 0°, and for the spray 4°. The spray = in ~ ~— 
end of in 1905, close to the riser pipe; and tl perat f the jet was very litt 
