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MAY 9 1877   MIMOSA                             Hot & Cold Water

A VESSEL OF WATER WAS ARRANGED AT SUCH A HEIGHT FROM THE TABLE THAT A CONTINUOUS DRIP OF WATER COULD BE MADE TO PLAY ON A SINGLE ONE OF THE SECONDARY PETIOLES. THE DRIP COULD BE REGULATED BY A TAP, & DROPPED ABOUT 9 C.M.

TEMPERATURE OF AIR 22 C, 71.6 F {at about 3.30}

THE WATER IN THE VESSEL WAS KEPT AT ABOUT 36C SO THAT THE WATER AS IT DROPPED ON TO THE LEAVES WAS ABOUT 40 about 34c, 93.2F

THE TEMPERATURE OF THE WATER TO WHICH THE LEAVES WAS TAKEN FROM TIME TO TIME BY PUTTING A THERMOMETER UNDER THE TAP

3.6.P.M DRIPPING BEGAN THE END OF 5 OR 6 PAIRS OF LEAFLETS SHUT CLOSE; THE TEMPERATURE WAS RATHER VARIABLE THE FIRST FEW MINUTES, BETWEEN 32 & 35 C F & F

3 13 3.16 3.21 3.25 3.31 3.36 3.47 3.55 4.9 4.12 5.30

C 35 = 95 33 35 34.2 33.8 34.4 32 34.2 31, 87.8 F LEAFLETS STILL CLOSE SHUT DRIPPING STOPPED LEAFLETS NOW OPEN

 

2.

THE VESSEL NOW FILLED WITH COLD WATER 19C, 66F, THE FIRST OF THE ARRANGEMENT REMAINING THE SAME.

4.15 ANOTHER SECONDARY PETIOLE OF THE SAME LEAF THAT WAS TRIED WITH HOT WATER, WAS PUT UNDER THE DRIP. IT WAS THEN LEFT TO ITSELF & AT 4.55 IT WAS FOUND ONLY PARTIALLY SHUT

5.4 HARDLY WIDE OPEN

5.30 STILL WIDE OPEN

THE DRIP WAS ALSO TURNED ONTO TWO OTHER LEAVES STANDING VERTICALLY ABOVE ONE ANOTHER, they shut quite closely on first receiving the drip, but & IN 5 MINUTES THEY OPENED OUT, the cold water dripping on them.─