THE KEEPING QUALITY OF CRANBERRIES. 



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. — Oxygen content of the water at various hours of the day in the reservoirs of 

 cranberry marshes in Wisconsin. 



Locality. 



Date. 



1918. 



Cramnoor Sept. 25 



Do [...do 



Walker ^ Sept . 26 



Black River Falls I Sept. 27 



BeaverBrook | Sept. 29 



1919. 

 Sept. 6 

 Sept. 10 

 Sept. 16 

 Sept. 19 

 Sept. 20 



Sept. 6 



Do 



Black River Falls. 



Phillips 



Cranmoor 



Walker 



BeaverBrook 



Do 



Black River Falls. 

 Do 



Sept. 8 

 Sept. 10 

 Sept. 11 



Hour. 



9 a. m 



10a.m... 

 11.30 a. m 



10 a. m... 



11 a. m. .. 



11 a. m... 

 11.30 a. m 



2p.m 



2p. m — 

 11.45 a. m 



fll^. m... 



\4.25p. m. 



/7.45 a. m . 



\3.40p.m. 



(11..30a. m 



\}. 45 p.m. 



/10.15 a. la 



\4.30p.m. 



Tem- 

 perature 

 (°C.). 



Weather. 



Clear... 



....do.. 



....do.. 

 15 Cloudy. 

 10 Clear... 



Oxygen 



per liter 



(c.c). 



do 



Cloudy 



Clear 



Cloudy 



Clear 



do 



Cloudy 



Clear 



Cloudv 



do 



do 



Clear 



do 



5.58 

 5.77 

 6.92 

 4.41 

 5.11 



5.19 



2.93 



3.74 



4.52 



2.22 



5.19 



5.9 



5.03 



6.00 



3.22 



3.74 



2.85 



4.28 



-Vpproxi- 

 mate 



satura- 

 tion (per 



cent). 



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 "wi'iters (Bergman), 

 is due to the photosynthetic activity of algas 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 ^vl•iters 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 dill'erences 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, w^ere 

 under water from three to five days. 



