860 The Exhalation of Ozone by Odorous Plants. [September, 
We next experimented with odorless flowering plants, selecting 
ten plants of the species Fuchsia globosa and ten periwinkles, 
species Vinca rosea, with the following results: 
No. experiment.| Schoenbein. | Guatacum. Pegged ae a Time. peyè} 
iO AAR marked- marked negative | negative |10 hours| clear 
WOI negative - marked "E Gere r: 
Nos BEL ia agens = negative | negative a iat " 
FOOT eee css. very slight| slight slight ares 
No, v..... cows . negative _ t -kaia 4 
BO. Visine vers “ slight marked “ ee s 
No. WES ok oo ue negative “ “cc “ Io “ 6 
During these observations, which were made in the month of 
July, 1884, the temperature within the case ranged from 80 to 
100° Fahr. It will be observed that sufficient ozone was gen- 
erated in four of the experiments to give one “marked” and 
three “ very slight” reactions ; also that the litmus gave no indi- 
cations of the presence of ammonia. Although they do not rank 
as active ozone-generators, nevertheless they must, from the facts 
of the case, be looked upon as sharing this important function in 
a slight degree. This decision also coincides with what had 
been previously demonstrated by experiment. 
e now made a trial of odorous flowering plants, selecting 
for this purpose seven roses and seven specimens of Lilium longi- 
Jorum. After carefully enclosing them within the case, the 
atmosphere of the latter was tested and simultaneously the aif 
outside, with striking results as shown by the following table: 
ae g i TN hoenbein| Litmus w State of 
cite experiment.| Schoenbein.| Guaiacum. Fo coe en er eae Time: | ther. 
No.1.........| negative | marked | negative blue | 8hours; clear 
No. Way so o's marked “ ‘e ; negative 9 “ c6 i 
No. 1........| negative | negative “ “e 9 * |pæly clou’y 
No Steina | marked marked yr gg clear 
No. v. eee ee eee marked d bie slight es 10 vig Lig 
Pe VE ein te a m very slight es = T 3 
Ne. Vil... 5. š te s ‘s “ ec “ 
No. YUk,- we ce ke negative — ‘cc rox e 
_ During these experiments the temperature of the air in the 
case ranged from 80 to 100° Fahr. The important conclusion 
_ arrived at in previous papers, viz. that odorous flowering plants 
re are active and energetic ozone-producers, it will be clear, re- 
! ee. researches entire confirmation. Since this 
