104 Mr. C. Tomlinson's Experimental Examination 



one side, and a fourth (a register) was placed on the other side. 

 The bottle with its thermometers was mounted in a west window 

 at noon on the 29th of December, 1862, all four thermometers 

 marking 51°. This arrangement was maintained about three 

 months, and a register was kept of the temperatures and the 

 appearance of the bottle two or three times a day. A few short 

 selections from this register will be sufficient for our purpose. 

 The upper thermometer had an elongated bulb, half of which 

 dipped below the surface of the mixture. This thermometer will 

 be referred to by the word " upper," while that in the lower 

 tubulure by the word "lower," the third thermometer by the 

 word "outside," and the fourth by the word "register." 



On the morning after the arrangement was made the readings 

 were as follows : — 



Dec. 30, 1862. 



8.30 a.m. Upper, 48. Lower, 45. Outside, 46. 

 Sun on window. 



3.15 p.m. „ 58. „ 57. „ 53. 



The top crust, which was abundant and much clustered about 

 the bulb of the upper thermometer at 8.30, had disappeared when 

 the afternoon reading was made. At night numerous stars were 

 circulating in the clear portion of the mixture. 



Dec. 31. 8.30, a.m. Upper, 42°. Lower, 41°. Outside, 41°. 



An abundant lower deposit heaped up towards the light to 

 the height of more than four inches, the upper crust also abundant. 

 2.0 p.m. Upper, 53°. Lower, 52°. Outside, 55°. 



Sun on window ; lower deposit much looser; feathers remark- 

 ably fine. 



o o , o 



At 3.45 p.m. Upper, 53. Lower, 51. Outside, 48. 

 „ 5.0 „ „ 50. „ 48. „ 45. 



Soft feathery deposit heaped up at the side nearest the light ; 

 top crust with feathers thick about bulb. 



Jan. 1, 1863. During the night the register stood at 39°. 

 11.30 a.m. Upper, 501°. Lower, 51°. Outside, 52°. 

 Windy and wet; feathers abundant and fine. 



3.30 p.m. Upper, 52°. Lower, 52°. Outside, 52°. 

 Windy weather equalizes the temperature, and produces a 

 deposit not heaped up towards the window, but nearly equally 

 distributed in the bottle. 



Jan. 2. Stormy, wet, windy; afterwards fine. 



8.0 a.m. Upper, 52. Lower, 52. Outside, 53^. 

 2.0 p.m. „ 53. „ 52J. „ 55. 



Deposit much shrunk from afternoon's warmth ; height 2| in. 

 5.35 p.m. Upper, 49°. Lower, 47°. Outside, 45°. 



