42 OYSTER BEDS OE JAMES RIVER, VIRGINIA. 
whole the young growth over 1 inch in length is numerically more 
than double that under 1 inch. 
The following table exhibits the data obtained from the several 
examinations made: 
Details of Examination of Wreck Shoal Rock. 
Station 
num- 
Date of ex- 
amination. 
Mean 
depth 
of wa- 
ter. 
Character of growth. 
Oysters caught per 
square yard. 
Estimated 
quantity 
oysters per 
acre. 
ber. 
Spat. 
Culls. 
Counts. 
193 
Aug. 19,1909 
Feet. 
12.0 
Dense 
0.0 
16.7 
10.3 
Bushels. 
195 
194 
....do 
9.0 
do 
7. 1 
30.3 
.0 
191 
195 
do 
8.0 
do 
2.5 
24.6 
3.8 
178 
196 
do 
9.0 
do 
23.7 
34.6 
.4 
301 
197 
do 
6.5 
do 
17.9 
69.2 
5.0 
497 
201 
. .do 
12.0 
. ...do 
18.3 
28.6 
1.4 
254 
202 
do 
11.0 
do 
21.8 
44.6 
3.6 
379 
203 
. . .do. . . . 
11.0 
do 
9.5 
57.7 
.0 
343 
204 
do 
10.0 
do 
26.7 
46.9 
.3 
379 
205 
do 
7.0 
do 
43.0 
45.0 
.4 
456 
206 
do 
11.5 
do 
15.8 
18.9 
4.2 
222 
209 
. .do.... 
14.5 
do 
12.7 
31.8 
2.3 
252 
428 
Aug. 31,1909 
15.0 
do 
3.6 
30.0 
2.7 
200 
429 
.do... 
6.5 
. ...do 
38. 1 
41.2 
.8 
413 
430 
do 
8.5 
do 
27.7 
60.0 
1.2 
460 
431 
do 
16.5 
do 
9.5 
30.9 
.4 
201 
DRY SHOALS ROCKS. 
These are 5 small rocks lying west of the preceding on and about 
shoals which ebb nearly or quite bare. They are in general isolated 
and surrounded by deep water, though two of them are connected by 
narrow ridges of depleted bottom with Swash Rock and Mulberry 
Swash Rock, respectively. 
Their present condition and extent are shown in the following 
table: 
Oyster Growth on Dry Shoals Rocks. 
Character of growth. 
Area. 
Oysters 
per acre. 
Estimated 
total con- 
tent of 
oysters. 
Dense 
Acres. 
126 
18 
9 
21 
Bushels. 
244 
124 
85 
20 
Bushels. 
30,766 
2,232 
765 
420 
Scattering 
Very scattering 
Depleted 
Total. . 
174 
34,183 
Four of these rocks are composed wholly or in major part of bot- 
tom bearing a dense growth of oysters, while the fifth, the smallest, 
bears a scattering growth exclusively. The dense growth in its daily 
yield to the tonger varies, with the locality , between 13 and 59 bushels, 
the average density over the entire area being sufficient to permit a 
