. Contributions to Canadian biology. Marine biology; Natural history. ST. CROIX RIVER AND PA88AMAQU0DDT BAT SESSIONAL PAPER No. 38a 153 From the data recorded a temperature curve for each set of observations at each station was drawn, and from the graphs thus obtained, isothermal sections were comstructed. The isotherms in every case were taken to represent the lowest limif of the temperature marked upon them. The graphs show that at different stages of the ebb-tide, there is not much change in the shape of the curve, but in the case of the section of the St. Croix river at the. ^i^-4- Fig. 1.
. Contributions to Canadian biology. Marine biology; Natural history. ST. CROIX RIVER AND PA88AMAQU0DDT BAT SESSIONAL PAPER No. 38a 153 From the data recorded a temperature curve for each set of observations at each station was drawn, and from the graphs thus obtained, isothermal sections were comstructed. The isotherms in every case were taken to represent the lowest limif of the temperature marked upon them. The graphs show that at different stages of the ebb-tide, there is not much change in the shape of the curve, but in the case of the section of the St. Croix river at the. ^i^-4- Fig. 1.—Temperature curves at Station 1 : (a) Aug. 7, \ ebb ; Aug. 6, \ flood ; (c) Aug. 19, \ ebb. Fig. 2.—Temperature curves at Station 2 : (a) Aug. 7, \ ebb ; (b) Aug. 4, ebb; (c) Aug. 6, \ flood ; Aug. 19, § ebb. Fig. 3.—Temperature curves at Station 3: (a) Aug. 5, § ebb; (b) Aug. 7, \ ebb; (c) Aug. 6, § flood ; (d) Aug. 4, ebb; (e) Aug. 19, \ ebb. Fig. 4.—Temperature curves at Station 4 : (a) Aug. 6, | flood ; (b) Aug. 5, § ebb; (c) Aug. 8, \ ebb ; (d) Aug. 19, \ flood. Biological Station (figs. 1-4), the whole curve moves to the right, , the tempera- ture rises at all depths. The graphs also show that the whole of the water increases in temperature as the summer advances. It will be noted that the temperature falls most rapidly near the surface, as a rule, and in many cases least rapidly about mid- water. The graphs at several stations, however, show that this condition is reversed, the most rapid decrease in temperature occurring in mid-water. This is particularly noticeable at stations 1, 10, 12, 16, 17 and 18 (figs. 1, 12, 10, 22, 11 and 15), while some of the other curves sviggest it. It is a noteworthy' fact that this character. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biological B
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