IV CONTENTS OF VOL. 111. 



Chap* Page 



SECT. iv. Periodical Springs and Lakes . 80 



1. Introductorv Observations . 81 



2. Comian Coring . . 8$ 



3. Paderborn Spring . . S3 



4. Lay-well Spring . . 85 



5. Giggles wick v ell . . 86 



6. Lake Zirknizer . . 97 

 V. Bubbling, Tepid, and Boiling Springs , 104 



1. lutrodud dry Remarks . . ib. 



2. On the Temperature of the Earth below the Sur- 



face, in regard to Springs and Hills 107 



3. Caldeira of St. Michael . 114 



4. Hot Springs in the District of Troas 1 , 7 



5. Hot Springs in Iceland . 119 

 vi. Alternating Hot and Cold Springs 140 

 vii. Inflammable Springs, Wells, and Lakes 144 



1. Introductory Remarks . . ib. 



2. Wigan.YVol), Lancashire . 147 



3. Broseley Sp. ing, Shropshire . 148 



4. Bituminous Fountain at Cracow, with a Notice 



of other Inflammable Springs 149 



5. Pitch-Lake of the Island of Trinidad 150 

 viii. Medical Springs, or Mineral Waters 160 



1. Introductory Remarks . jb, 



2. Principal Foreign Medicinal Waters 161 



3. Principal Domestic Mineral Waters 171 



4. Means of analysing Mineral or Medicinal Waters 178 

 ix. Cataracts and Inundations . 213 



1. Cataracts of the Nile . ib. 



2. Falls of the River Niagara . 215 



3. Fall of F,yers . > gl7 



4. Brief Survey of other Remarkable Cataracts 219 

 x. Lakes, Lochs, and Loughs 226 



1. Introductory Remarks . 226 



2. General Surrey of Lakes, chiefly worthy of no. 



tice, in different Quarters of the World 231 



Asia . . ib. 



Africa . . ib. 



Europe . . 232 



