208 § D. Kirkwood on the mean Motions of Jupiter, etc. 
89,299 cubic inches. Considering the metal as cast iron, the 
weight of which is to the weight of distilled water, frozen, as 
2,070 is to 1000, and that the cubic centimeter of such water 
weighs 20-031 grains, we may infer that the meteorite weighs 
164,537, “arrobas!”* 
This is all the information I can give regarding the meteorite 
of this Hacienda, and I fear it is too scanty, and perhaps too lit- 
tle exact, to satisfy the learned professor for whom it is intended. 
The pieces that I send will enable him to ascertain the sub 
stances of which it is composed ; and if some photographer 
should come in this direction, I will have it photographed, and 
ill take much pleasure in sending you a copy. 
I am still less informed in regard to the meteorite of San 
Gregorio, since I have seen it only twice, in 1856.+ tis larger 
than the one at this place, sad seems to consist of the same 
material, has very much the shape of a sofa, and bears an inserlp: 
tion, which reads thus (translated) : 
“Only God with his power 
This iron will destroy, 
For the world will have 
No one able to divide it in pieces.” 
In my opinion, this meteorite and the one we have here are 
fragments of another much larger one, that probably burst at 4 
suflicient height from the earth to cast one piece on this Hace 
enda, another one on that of San Gregorio, 10 leagues to the 
northwest, and other larger ones on Chupaderos, 20 leagues 
the northwest of this place. I have not seen the latter ones, 
which are said to be the most curious; but I have already taken 
some steps to have them carefully examined, and I promise 
myself the satisfaction of transmitting the result to you. 
enn 
Arr. XXVIL—On the Mean Motions of Jupiter, Saturn, Uranus, 
and Neptune; by Professor DANIEL KIRKWOOD. 
THE recent note of Professor Peirce,t announcing his dis: 
covery of some TWh ee ee between the mean motions 
while engaged 
* One arroba is equivalent to 25 lbs, ourbal, 
ee rs fog article on this meteorite by Dr. J. Lawrence Smith, see this J¢ 
> 4 i : 
thi This Journal for January, 1872. It will be observed that Professor : aa 
oe equation is identical with that discovered by Professor Newcomb inl 
Gould’s Astr. Journ., vol. v, p. 101. 
