340 On Currents in Water. 



the tracks of livino[ birds from those on stone, and when amongrhiin- 

 dreds of examples which I have seen, not one was opposed to the 

 idea of their being the veritable foot marks of birds, it seemed to 

 me that the case was a very strong one. It would be strange if I 

 should not have failed to get at the exact truth, on every minor point 

 of the subject ; especially as my insulated situation in respect to Zoo- 

 logical collections, has prevented me from making all the compari- 

 sons which I could wish ; but T shall be happy to be corrected 

 wherever I am erroneous, even if it be in my fundamental conclu- 

 sions ; and with no little trouble, I have made such arrangements, 

 that for a reasonable return of specimens in natural history, especial- 

 ly petrifactions, I shall be able to furnish geologists, who may desire 

 them, with accurate casts of my best specimens colored so as to re- 

 semble the rock; and probably with some specimens in the rocks; 

 while my own specimens will always be accessible to their inspec- 

 tion ; so that if the views I have presented, are not satisfactory to 

 geologists, I shall at least have put within their reach, the means 

 of arriving at the truth. 



\ 



Art. XXI. — On Currents in Water; by Alan W. Carson 



Whitemarshj^Montgomery County, (Penn.) 2d mo. IT, ISoo. 



TO PROFESSOR SFLT.lMAX.* 



About twelve months ago, I received a letter from my friend, 

 George Kenderdine, an ingenious and scientific master millwright, 



I ^ 



in which he stated that Samuel D. Ingham had called his attention 

 to the circumstance, that water drawn out of a vessel, through an 

 aperture in the middle of the bottom, acquires a rotary motion in an 

 opposite direction to the apparent motion of the sun ; and stating 

 that after much thinking upon the subject, he believed he had dis- 

 covered the cause, which he explained at considerable length. With 

 his permission the letter was read at a meeting of the Montgomery 

 County Cabinet of Natural Science, and after making some enquiry 

 into the subject, it w^as believed that few persons had noticed the 

 circumstance of the revolutions being always in the same direction, 

 and for aught that could be discovered, it did not appear to have 



We 



aave retaiued this paper for some months, wishing for an opportuBitj lo 

 examiue the facts in the case; but as this has not been in our power, and as the 

 communicatiou is well written, we conclude to ?ive it room, and let it take i»s 

 chance with the scientific world.— ^il 



