24 PHILOSOPHICAL TRANSACTIONS. [aNNO 1724. 



being then at 20 degrees; an hour after, he found the water still fluid in both 

 the balls, but after the exhausted ball was again filled with air, the water, as 

 in the former experiment, was very soon mixed with icy lamellae; and their 

 production was so instantaneous, that it could hardly be observed with the eye. 

 Before he broke one of the balls, he separated the water in the said cup from 

 the icy lamellae, on which he broke the ball, and threw the ice into water; the 

 ice, it is true, floated on the water, but he in vain expected the production of 

 the lamellae in the cup. M. Fahrenheit postponed the further trial of these 

 experiments till J 1 o'clock at night, when he exposed three balls in a keen frost; 

 two of these balls were again filled with water about half full: and the third 

 ball was filled about three-fourth parts full; the temperature of the air was by 

 the thermometer marked at 26 degrees; at 4 o'clock in the morning he found 

 the temperature of the air the same by the thermometer, and the water in the 

 two balls, which were only filled half full, still fluid; but in the third ball the 

 water was frozen and the ball broken. The ice was intermixed with very small 

 bubbles, but few in number, and its transparency was very much interrupted, 

 and resembled the confused crystallization of some salts. 



M. Fahrenheit, being still desirous of viewing the production of the lamellas 

 in the glass cup, took the said vessel into the room where the former experi- 

 ments were made, and happening to stumble a little, the water in the glass was 

 agitated, and in that very instant the whole mass appeared intermixed with 

 several icy lamellae. By this accident he discovered, that ice could be produced 

 in pretty cold water by agitating it, and this put him on trying whether water 

 would freeze in vacuo by agitation. Therefore, after shaking the ball a little, 

 he observed the same phenomenon, and at the same time found his mistake in 

 attributing the fluidity of the water to the absence of the air. 



Concerning the Difference in the Height of a Human Body, between Morning 

 and Night. By the Rev. Mr. JFasse, Rector of Jy^iho in Northamptonshire. 

 N"383, p. 87. 



Mr. Wasse having measured a great many sedentary people and day-labourers, 

 of all ages and shapes, found the difference in their height between the morn- 

 ing and night to be near an inch. He tried himself when sitting, and found 

 it in like manner; particularly, August 21, 1723, he sat down, at 11 in the 

 mornmg, and fixed an iron pin so as to touch it, and tliat but barely. After- 

 wards fatiguing himself for half an hour with a garden-roller, the consequence 

 was, that at 12*' 30"" he could not reach the nail sitting, by about -rV of an 

 inch. At 2 the same day he wanted near -A- "^ '>" '"ch. On the 21st, at 

 &^ 30™ in the morning, he touched the nail fully ; and after the abovcmentioned 



