39° 



BOTANICAL GAZETTE 



[may 



TABLE II B 



Two PERIODS (22.25 MIN. EACH) IN SEA WATER FOLLOWED BY 5 EQUAL PERIODS IN 



SEA WATER CONTAINING 0.8 PER CENT FORMALDEHYDE (2 PERCENT 



BY VOLUME OF 40 PER CENT FORMALDEHYDE) 



Solution 



Change in PH 



Relative rate of respiration 



Sea water . 



u a 



Sea water containing 0.8 per cent 



formaldehyde 



Sea water containing 0.8 per cent 



formaldehyde 



Sea water containing 0.8 per cent 



formaldehyde 



Sea water containing 0.8 per cent 



formaldehyde 



Sea water containing 0.8 per cent 



formaldehyde 



90-7 

 90-7 



90—6 



90—6 



90-7 

 90 — 6 

 90—6 



55 = 0.35 

 55 = 0.35 



8 I = I . 09 

 96 = 0.94 

 03 = 0.87 

 95 = 0.95 

 95 = 0.95 



1.094-0.35 = 3.1 

 0.94-^0.35 = 2.7 

 o.87-f-o.35 = 2.5 

 0.95^0.35 = 2.7 

 0.95-7-0.35 = 2.7 



TABLE II B CONTROL 



Five periods (20 min.) in sea water 



TABLE II C* 



Two periods (35.5 min. each) in sea w.ater and during 6 equal periods in 



SEA water containing O . 3 PER CENT (bY VOLUME) OF CHLOROFORM 



Solution 



Relative rate of respiration 



Sea water . 



Sea water containing 0.3 per cent 



chloroform 



Sea water containing 0.3 per cent 



chloroform 



Sea water containing 0.3 per cent 



chloroform 



Sea water containing 0.3 per cent 



chloroform 



Sea water containing 0.3 per cent 



chloroform 



Sea water containing 0.3 per cent 



chloroform 



1.734-0.615 = 2.8 

 1 .254-0.615 = 2 .0 

 0.884-0.615 = 1 .4 

 0.484-0.615 = 0.78 

 0.384-0.615 = 0.62 

 o. 18-^0.615=0.29 



* In the control, with 8 periods (31.5 min. each) in sea water, the change in PH in each period was 

 8.03 — 7.80 = 0.23. 



t Approximate (at this point the indicator is not very sensitive to changes in PH). 



