524 PROF. J. W. JFDD AFD C. HOMEESHAM 



meter was kept down varied from 45° to 57° P., and that of the 

 water overflowing at the surface was 59° F. 



Comparing the result thus obtained with that arrived at by the 

 observations previously recorded at the depth of 1337 feet, we find 

 that the increase in temperature for the last 110 feet is only 1J° P., 

 or at the rate of 1° E. for 88 feet. "With an assumed surface- 

 temperature of 50° P., the average increase for the whole depth of 

 the well would amount to 1° ¥. for 54-09 feet of descent, the result 

 previously obtained being 1° F. for 52-43 feet of descent. 



The additional 38 feet of strata sunk through all evidently belong 

 to the same series of beds, variegated sandstones and marls, which 

 had been penetrated previously to the depth of 170 feet. The de- 

 tails of the strata passed through in the last 38 feet were as follows : — 

 The beds (18)* " soft red and white sandstones, finely laminated in 

 places," had a total depth of about 32 feet ; then succeeded — 



ft. in. 



19. Mottled sandstones, becoming intensely hard at their base 4 



20. Softer mottled sandstone with " clay-galls " 6 



21. Finely -laminated soft mottled sandstones 12 



22. Very hard red sandstones, the joint-planes coated with green 



incrustations 1 3 



23. Soft green shaly rock 9 



24. Hard red sandstone, like 22 1 3 



25. Dark-red sandstone, softer 1 9 



26. Very fine-grained red sandstone 1 



27. Very hard red sandstone, which had to be ground away, and 



could not be brought to surface in cores 4 



28. Hard white fine-grained sandstone, with no lamination, but 



exhibiting a rude dip 4 



Total thickness of variegated strata underlying the G-reat Oolite ... 208 



The following apparent dips were measured in the cores brought 

 up in the last 38 feet : — 



Dip. 



At 141 1 feet from the surface 27° 



„ 1412 „ „ 28° 



1420 

 1421 

 1431 

 1433 

 1437 

 1438 

 1443 



26° 

 28° 

 27° 

 26° 

 32° 

 32o 

 33° 



With regard to the question of the geological age of these strata 

 we have, unfortunately, but little fresh evidence to offer. 



The new facts derived from the examination of the dips exhibited 

 by the cores are almost conclusively in favour of these rocks having 

 a true dip of about 30°, complicated by much false-bedding. This 

 is indicated by the circumstance that the finely-laminated strata 

 exhibit the most variable apparent dips, while those beds with very 

 imperfect stratification, which probably show true dip, nearly always 

 * Loc. cit. p. 750. 



