310 Analyses of Books. [April, 



ctirrent, I found the temperature was just 65°, while the working 

 part at the same depth was 74°. 



In Wheal Trumpet Tin Mine, the extreme eastern part at 75 

 fathoms in depth, has not been worked for 18 months. This gal- 

 lery has no other communication with any other part of the mine 

 for a distance of more than 20 fathoms in length : here the tem- 

 perature was two months since 52°; tlie working part, 30 fathoms 

 distant, at the same time, and at the same depth, was 67°, the 

 temperature of the open atmosphere being 60°. At the 86 

 fathom gallery in this mine, the water that issues from the vein 

 was 51°, while the air of the same place was 68*7°. 



I have also proved the temperature of several old mines which 

 have ceased working for many years. At the adit level of Old 

 Trevenen Tin Mine (14 fathoms from the surface), the tempera- 

 ture was less by 4° than the common atmosphere. This most 

 probably may be owing to the stillness of the air, and not being 

 subject to such quick variations of temperature as on the surface. 

 A shaft in this mine being full of water from the bottom to the 

 adit level, the water proved 2*5° lower than the atmosphere at 

 the surface, which, in my opinion, clearly proves that had the 

 bottom part of this mine (about 110 fathoms) been much warmer 

 than the surface of the earth, its heat would, in the course of 

 eight years, which is the time since she ceased working, have 

 been communicated to this water generally, especially as this 

 shaft is always overflowing, and in which case it would be indi- 

 cated by the thermometer. 



I might adduce more instances to prove what I have here 

 asserted, but I conceive sufficient has been said to show that 

 Mr. Fox could only have tried places in which the air was 

 influenced by the presence of the workmen. I can also prove 

 that considerable variation in the temperature of a part of a 

 mine is caused by the different currents of air, being in some 

 places very still and confined, and in others, a few feet distant, 

 »o strong that a candle is constantly blown out. 

 I am. Sir, your humble servant, 



M.P. MOYLE. 



Article IX. 



Analyses of Books. 



Mtmoires de la Socitte de Physique et d'Histoire Naturelle de 

 Geneve, Tom. J . Premiere Partie, I 



We arc informed in the preface to this work, that although 

 the Physical Society of Geneva originated in 1790, yet the 



