Prehnile. — Steam Engines.— Nautical Ephemeris. 461 



PREHNITE DISCOVERED IN GLOUCESTERSHIRE. 



Mr. Bakewell has recently discovered Prenhite in a rock of 

 Basaltic Amygdalin at Woodford Bridge, near Berkley In Glou- 

 cestershire. Tliis n)ineral has not, we believe, been found before 

 in any part of England or Wales, though it occurs in Scotland and 

 various parts of the world. The Basaltic Amygdalin of Wood- 

 ford Bridge contains also decomposing agates, zeolite and green 

 earth. It is further remarkable for having in the upper part large 

 and perfect organic remains of coral, of which Mr. Bakewell 

 brougiit avvav a fine specimen imbedded in basalt. The occur- 

 rence of marine animal remains in this rock may revive the long 

 agitated question respecting the igneous or aqueous formation of 

 basalt. 



STEAM ENGINES IN CORNWALL. 



Messrs. Lean, in their report of work done by steam engines 

 in Cornwall, in November, notice an error in their report for 

 October. — For 39,556,496, the work done by Mr. Woolf's en- 

 gine at Wheal Vor in October, read 40,920,513 pounds lifted 

 one foot high with each bushel of coals. 



The comiters of some of the engines have been idle in Novem- 

 ber. The average work of twenty-six reported was 20,538,498 

 pounds with each bushel. The others reported are: 



Woolf's engine at Wheal Abraham, loaded I5"l per square 

 inch in cylinder, lifted 46,648,718 pounds with each bushel of 

 coals. His other engine at that mine, loaded 3*1 per inch, lifted 

 21,460,944. 



Another engine of his, at Wheal Unity, load 138 per inch, 

 appears in this report — Work 34,432,825 pounds lifted with 

 each bushel. An old engine at Wheal Abraham, now under the 

 management 'of Mr. Woolf, lifted 34,152,162 pounds per 

 bushel. 



The altered engine at Wheal Chance, alluded to in our two 

 last numbers, lifted 43,970,893 pounds with each bushel j — load 

 per inch 13*4. 



NAUTICAL EPHEMERIS. 



Sir, — It seems rather extraordinary that, whilst so many are 

 fruitlessly endeavouring to find errors in our excellent Nautical 

 Ephemeris, no one should have noticed the almost entire omis- 

 sion (for the last two years) of the occultations of the planets or 

 fixed stars by the moon. I am tlic more surprised at this omi.s- 

 sion, as no cause has been assigned for it ; and the notice re- 

 specting the notation, as well as the exhortation to mariners and 

 travellers to observe the occultations as often as possible, are still 



coutinued 



