;No. 7.] MISCELLANEOUS. 429 



about 25 miles south of Berlin. The following details conceru- 

 ing it are from the Geological Magazine: 



'' The boring for t!ie first 956 feet (98:]£- English feet) was 

 made by manual labour, at a cost of about £1600. 



"Several accidents having happened, the borehole was then 

 lined for a depth of 85 feet (^TJ English feet) with tubes of 

 15 inches diameter; beyond that, to t'ae depth of 100 feet (103 

 English feet), with 1-i inch tubes ; and then to oQSh feet (374, 

 English feet) with tubes of 12J inches diameter. 



" The length of time occupied in the above-mentioned work was 

 fifteen months, comprised between May, 1867, and July, 1868. 



"From the depth of 956 feet (983| English feet), for the 

 rem iining distance, the boring was cirried on by means of a 

 steam engine. Ttie length of time consumed in sinking this 

 aiiitional 3095 feet (3184|- feet English), comprised betweea 

 January, 1869, and the 15th September, 1871, was about 31J 

 months, during which interval several accidents occurred. 



'•The totil expenditure upon the whole boring, 4051 feet 

 (4172^ English feet), both by manual labour and by steam power, 

 was about £8717 14s., making the average cost for every Prus- 

 sian foot in depth about two guineas, or about £2 Is. 9d. per 

 English foot. 



" The whole time spent on the work was 51J- months; but as 

 there was an interval of 5 months, between July, 1868, and 

 January, 1871, during which period the boring operations were 

 suspended, the actual number of work'ng months becomes re- 

 duced to 46^. 



" The process of boring throughout was by percussion borers 

 worked by rods ; and the rocks bored through belonged to the 

 Triassic series. 



" The progress of the work would have been much greater but 

 for the accidents which took place, and for the delays which 

 were caused by the observations that were made as to the increase 

 of the temperature of the earth in depth, &c." 



The next hole, as regards depth, is that executed under the 

 direction of Mr. Charles H. Atkesou on the grounds of the St. 

 Louis Co. Insane Asylum in Missouri. It was begun in March 

 1866, and finished in August, 1869, the depth reached beino- 

 3843J- feet. The last 40 feet of the hole was through granite, 

 but the beds above this were of the Lower Silurian and Carbou 

 iferous formations. 

 ToL. AMI. i>v 



