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obeying some magnetic law; and the course of a disturbed flock 

 would sometimes be like festoons on a line. On inquiry of resi- 

 dents here, I was told they were pigeons proceeding to a rendez- 

 vouz near Vincennes, the shire town of Knox County, Ind., and 

 situated on the east bank of the Wabash, lat. 38^ 42' N. and 

 long. 10^ 28' W., 120 miles S. W. of Indianapolis, 168 W. N. 

 W. from Cincinnati. Their flight, when undisturbed, was evi- 

 dently in that direction. Flock after flock continued to be pass- 

 ing, until 5 o'clock, P. M., when public services at Christ Church 

 obliged me to leave the observation ; but it is said, they continued 

 until nightfall. The next day an occasional flock passed, until a 

 heavy rain drove them to the earth, and then the trees in the 

 neighborhood fairly broke down, it is said, in some cases, from 

 their weight. The rain on Sunday prevented their flight, and the 

 sportsmen were busy ; but on Monday I could not find a single 

 straggler. The specimens brought to town proved the bird to be 

 the " Ectopistes migrator ius,''^ or Passenger Pigeon. 



Prof. H. D. Rogers exhibited a number of fossil impressions 

 occurring in the red shale, or carboniferous red sandstone, next 

 underlying the anthracite coal measures of Pennsylvania. A 

 portion of them are identical with specimens found some years 

 ago, by Isaac Lea, Esq., of Philadelphia, in the same geological 

 horizon, and by him attributed to Reptilians ; others are from a 

 horizon 1,300 feet lower. These specimens also present a series 

 of impressions, not observed by Mr. Lea in his specimens, con- 

 sisting of the right and left feet, and apparently the fore and hind 

 feet, of a small species. Prof. Rogers had not yet formed defi- 

 nite conclusions as to their nature, but they are obviously Rep- 

 tilian. They occur invariably upon surfaces which appear to have 

 been slimy and exposed to the air ; some show the spots which are 

 attributed to rain drops ; others, trickling water marks and wave 

 marks. The slimy surface is attributed by Prof. Rogers to the 

 finest clayey deposit from the ocean, at different intervals, giving 

 the rock the tendency to scale off* in thin layers. The thickness 

 of the carboniferous red sandstone is estimated by Prof. Rogers 

 at 3,000 feet ; some of these specimens came from a depth of 

 2,000 feet in that formation, and appear to be the oldest vestiges 



