1914.] NATURAL SCIENCES OF PHILADELPHIA. 559 



depth of from 900 feet to over 1,000 feet below the floor of the crater. 

 They are to be seen at the American Musemii of Natural History, 

 New York. 



Only a small and unfortunately the central portion of the crater 

 has been explored by the drill, not more than y^ of the total area of 

 the crater, but undoubted meteoric material (small pieces of "iron 

 shale" or magnetic nickel-iron oxide) have been brought up by the 

 drill, as stated in my previous papers, from a depth of between 700 

 and 800 feet below the level of the floor of the crater, whicli is 

 about 440 feet, on an average, below the level of the surrounding 

 plain. The drill holes were located there because we did not at the 

 time this drilling was done appreciate the direction from which the 

 meteoric mass approached or properly interpret the evidence which 

 now causes us to believe that it lies under the southern wall of the 

 crater, some 2,000 feet distant from where the drilling was done. 

 We did not take into consideration certain facts now very plain to 

 us and to anyone who may visit the crater or carefully study the 

 maps, once his attention is called to these facts, which should have 

 shown us that it approached at quite an angle from the north, per- 

 haps as much as 30° from the vertical. 



In the first place, the greatest amount of iron meteorites and 

 especially those of the "shale ball" variety, described in my previous 

 papers, have been found on the northern slope of the crater and on 

 the plain beyond — accurately, slightly to the east of a north and south 

 line passing through the centre of the crater. In this connection it 

 may be of some interest to know that there was found al:)out a mile 

 and a half from the crater in a north-northeast direction three years 

 ago the largest Canyon Diablo iron meteorite which has ever been 

 found. The following are the dimensions of this meteorite, which 

 is of the ordinary Canyon Diablo type, with characteristic pittings, 

 etc.: 



Length 3' 2" 



Width 2' 5" 



Height , 1'3|" 



Greatest circumference 8' 3|" 



Least circumference 5' 7" 



Estimated weight Between 1,700 and 2,000 pounds. 



It is to be seen at the museum- which has been built at the crater. 



2 The collection of meteorites, metamorphosed sandstone, specimens of all 

 the strata penetrated, etc., in this museum and in the collection at the American 

 Museum of Natural History, in New York City, which has been loaned to it 

 by Princeton University, should be seen by all those who are interested in the 

 subject. 



