THE KEEPING QUALITY OF CRANBERRIES. é 
water at the same station increased from 2.85 c. c. at 10.15 a. m. 
to 4.28 c. c. per liter at 4.30 p. m. 
TABLE II.—Ozxygen content of the water at various hours of the day in the reservoirs of 
cranberry marshes in Wisconsin. 
Approxi- 
Tem- Oxygen | mate 
Locality. Date. Hour. perature Weather. perliter | satura- 
(EO (c.¢c.). | tion (per 
cent) 
1918. 
Cranmoons cc cecswsiwisersteesé Sept. 25 ies Wee wi owes is ae ativardisiulherals 2 BS x 
1B ka) Les ppl TINA Da RR V SSI) Se pel AMOS rom A AU eI OD eres 
BuViea lle rye tes Da UE deta. Sept. 26 | 11.30a.m-..... We eaoee ORO EG A 6. 92 98 
Black River Falls... 202.2... | Sept. 27 | 10a.m-.-...... 15 | Cloudy........ 4.41 64 
P Beaver Brooks, .. 2505 02. wb os Seps.29) | Tia. me a) Og. Clearseshai ies 5. ll 74 
1919. 
15 [ope Regal GU Wh dR ONE OE Be tei SepeGy| li a. md ees ee V5) Wage. GON sale 5.19 75 
Black River Malis ss we cept, 10 1130 ae TMi 2)-.. 4p Cloudy BAC 2: 4 a 
WLP Sas Yo SPARS AE Ak ept. PTs AN (212), ACY Se : 
Cinmeces YEP ED siiye on ena 0,” Bedi! LOM 2A une eae eee 15) Cloudy sees: 4,52 65 
Wialiker. 275) SOW SY Sept. 20} 11.45a.m..... 17 ree BAM ati 2.22 33 
x LA ey eae To eee Ons 5.19 75 
Beaver Brook....-.....-.-.--- Sept. 6 {i935 oc 14 | Cloudy........ 5.9 86 
D Sangh 18 TeeBVey lan Be 159) Clears.) eee a 5. 03 72, 
BS: ern 3t3 aes 24 ep {3 Apne) 15 | Cloudy........ 6. 00 86 
m4 
Black River Falls...........-- Sept. 10 eet ; i nh ae BF or e 
LON S aaa sas 1S) || (Olepye gee ee 2. 85 41 
DOls.s-2-2e verse een e dee pepe. bh (4 30 p.m... 17 do 4.28 64 
The difference in the oxygen content of the water on a clear day 
as compared with a cloudy one is not as great in this case as in many 
instances observed in Massachusetts. This is due, no doubt, to the 
lower temperatures and poorer illumination in the case of the Wis- 
'consin waters, as these were examined in September, while those in 
Massachusetts were examined in summer. 
The increase in the oxygen content of flooding water during the 
day, as explained in other papers by one. of the writers (Bergman), 
is due to the photosynthetic activity of alge and other aquatic plants 
in the reservoir. This activity must necessarily be less in the cool and 
relatively darker days of September than in midsummer. 
EXPERIMENTAL TESTS OF THE KEEPING QUALITY OF WATER-RAKED 
CRANBERRIES. 
The observations of the writers in the markets during 1918 indi- 
cated that water-raked berries often show poorer keeping quality than 
dry-raked or dry-picked berries from the same marsh. Table III 
gives typical examples of the differences frequently observed. 
Figures such as those given in Table III, while suggestive, are open 
to criticism, since the lots were not in all cases strictly comparable, 
having come from different places in the bog, and the water-raked 
berries were not harvested under the best possible conditions. Some 
of the Searls variety, on which the report is made, for example, were 
under water from three to five days. 
