PRODUCTION AND COLLECTION OF SEED OYSTERS 
209 
and is completed before the 10th of July. The flats exposed at low tide are carefully 
cleaned from accumulations of eelgrass and other debris, and scallop shells are dis- 
tributed evenly over the exposed areas. The shells are deposited very densely and 
raked in such a manner that they stand on the edges, thus affording the greatest 
surface for the attachment of the larvse. Planting of shells never extends below low- 
water mark. 
For the experiments with spat collectors the locations indicated as Stations I, 
III, and VIII (fig. 4) were chosen. Station III was located on the grounds where 
scallop shells were planted; Stations I and VIII were located along the western 
shore where no planting was done in 1926, although a certain amount of shells was 
left from previous operations. Field observations at Wareham were carried out 
during the summer of 1926 by R. W. Crozley, under the direction of the author. 
TEMPERATURE OF THE WATER 
Present observations cover a period of 40 days (July 9 to August 17, 1926) 
when temperature readings were made at 8 different stations in the river. (Fig. 4.) 
Before discussing the results of these observations, it is interesting to note that there 
were only slight differences between the temperatures in the upper part of the bay 
and at its mouth; in other words, that the horizontal distribution of temperature 
along the whole area of Wareham River was nearly uniform. This is clear from an 
examination of Figure 5, where temperature readings taken at the surface of the 
water between 9.50 a. m. and 11 a. m. of August 25 are shown with the figures of 
salinity. One will notice that the temperature in the upper part of the river above 
Barneys Point was approximately 0.5° C. higher than that in the lower part of the 
river. These observations were made on a calm, warm day. 
In a shallow body of water with a considerable range of tide, the hourly fluctua- 
tions of temperature may be quite large. The best method to study them is by 
installing a thermograph and obtaining a complete record for a given period of time. 
Unfortunately, because of the local conditions this was not feasible, and our records of 
hourly fluctuations of temperature refer only to three days, August 14, 28, and 
September 28, when readings were made at Station II every half hour between 
5.20 a. m. and 6.30 p. m. The results of these observations are presented in Tables 
1, 2, and 4. As can be seen from an examination of these tables, the greatest 
fluctuation in temperature (1.7° C.) was observed on August 28. 
Table 1. — Hourly fluctuations in the temperature and salinity 1 of water in Wareham River, August 
14 , 1926 2 
Time 
Station II 
Station 
VIII 3 
Time 
Station II 
Station 
VIII a 
Temper- 
ature, 
° C. 
Salinity, 
per mille 
Salinity, 
per mille 
Temper- 
ature, 
0 C. 
Salinity, 
per mille 
Salinity, 
per mille 
26.0 
28.31 
28. 36 
26 0 
26 06 
26 68 
26.0 
28. 49 
28. 69 
4.30 p. m 
26 0 
26 25 
27 72 
26. 1 
28. 53 
28.85 
5 p. m 
26.2 
26 58 
27 25 
2 p. in 
26. 5 
28. 36 
28. 98 
5.30 p. m 
26. 3 
26 98 
27 30 
2.30 p. m 
27.0 
24. 66 
27.00 
6 p. m 
26. 0 
28 26 
28 26 
3 p. m 
26.0 
25. 39 
20. 00 
6.30 p. m 
25. 7 
27. 07 
27 23 
26.2 
25. 33 
26. 20 
7 p. in 
25.6 
27. 03 
27.23 
1 Temperature and salinity readings given in this table were taken at the surface. 
2 High water at 11.55 a. m.; low water at 4.51 p. m. Range of tide, 2.8 feet. 
i' Observations at Station VIII were made 5 minutes after time shown. 
