436 BOTANICAL GAZETTE ‘ [DECEMBER 
Xanthium, and none for Martynia. The last column of the table 
gives the total number of comparisons made. 
TABLE VIII 
Instrument Plant Cras C=r G4 Total 
Pita ee oa I I 6 8 
Brown atm....4 | Xanth.......... 3 4 I 8 
Mattyn S02 eu: ° 4 ° + 
Physab eh: 2 I 5 8 
waeek Sn. 4 | Aamo... 3 4 I 8 
MANO a 2 2 ° 4 
Cl Piel. 2.0 ss ° ° 8 8 
White atm... 1) Manth..-... sic, I 2 5 8 
iv, ) I 3 4 
2. From table VIII we derive the generalization that for all cups, 
under all test conditions, Physalis shows the most frequent occur- 
rence of coefficients greater than unity. Martynia shows the least 
frequent occurrence of these. Physalis, therefore, is usually more 
sensitive to light changes than the cups; the other two plants are 
generally equally sensitive or less so. 
3. For the white cup, for all plants, and under all test conditions, 
the great majority (16 out of 20) of the coefficients are greater 
than unity. This cup is generally not as sensitive to light varia- 
tions as are the plants. 
4. The brown and black atmometers agree in giving mainly 
coefficients for Physalis which are greater than unity, while for the 
other plants they are equal to or less than unity; see 2. : 
Turning now to an analysis of the coefficients of the other 1n- 
struments, we may treat them as we have the atmometers, only 
classifying them as less than, equal to, or greater than 0. 50 instead 
of 1.00. We may consider as equal to 0.50 all coefficients from 
0.40 to 0.60, inclusive. Table IX presents the classification on 
this basis. 
5. It appears from this array of figures that the integrator gives 
predominance to coefficients greater than 0.50, while the other 
instruments give them equal to or less than 0. 50: 
6. “Solio” paper shows the strongest tendency to give coefli- 
