. Contributions to Canadian biology. Marine biology; Natural history. ST. CROIX RIYER AND PASSAMAQUODDY BAY 155 SESSIONAL PAPER No. 38a varies witli tlie state of the tide, and with more data it would doubtless throw some light upon the tidal currents. It also appears that the temperature at the bottom at station 3 did not change with the tide, but rose as the season advanced. The two isothermal sections of the St. Croix river at the Bioloffical Station (figs. 5 and 6), taken at nearly opposite states of the tide upon succeeding days, show a most interesting change in the arrangement of the la
. Contributions to Canadian biology. Marine biology; Natural history. ST. CROIX RIYER AND PASSAMAQUODDY BAY 155 SESSIONAL PAPER No. 38a varies witli tlie state of the tide, and with more data it would doubtless throw some light upon the tidal currents. It also appears that the temperature at the bottom at station 3 did not change with the tide, but rose as the season advanced. The two isothermal sections of the St. Croix river at the Bioloffical Station (figs. 5 and 6), taken at nearly opposite states of the tide upon succeeding days, show a most interesting change in the arrangement of the layers of water. It will be seen that with a rising tide (fig. 5), the warmer water is massed near the Canadian shore —the right hand side of the figure—while with a falling tide (fig. 6), the colder water is heaped up at almost exactly the same place, while the warmer water is spread out towards the United States bank. The section of the river at St. Andrews (fig. 13) shows the same general arrange- ment of the water, showing that it extends down to that point. It also confirms the evidence of a tidal change, as it will be noted that the cold water is about the centre of the river, while the section represents observations taken between flood tide and one-third ebb—just the time when the other two diagrams would lead us to expect @ '^ %5. ® ^ ^3^.. 5 ' /<? /5 Fig 13.—Profile section ot the St. Croix River at St. Andrews, Aug. 10. Tide beginning to fall (flood to g ebb).. the current of cold water to be crossing from the United States to the Canadian bank. This is a most interesting set of facts, which demands further investigation, as our present knowledge of the conditions in the St. Croix river and Passamaquoddy bay suggests no explanation. Apparently the great tidal currents in the bay swing round the current coming down the river, but just what these currents are and how they act we do not at present know. It is also noteworthy that the warmest water does not pas
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