66 N. 8. Maskelyne on Aerolitics. 
Greg in our own country, and besides many papers of Baron 
Reichenbach in Poggendorff’s Annalen, Hofrath Haidinger has, 
by his active pen and energetic mind, contributed, in Austria, 
erhaps more valuable notices on the fall of meteorites than all. 
other living authors; and Dr. J. Lawrence Smith, as well as Prof. 
Silliman, by their accurate collection of facts and by their own 
investigations as chemists, have done much for the subject in 
erica, where also the vigilant activity of Prof. Shepard has 
been conspicuous in collecting and distributing the specimens 
themselves. 
The more special and exact literature, that, namely, which de- 
tails the work done on meteorites in the laboratory, carries the 
names of the best inorganic analysts of this century, including — 
those of Rose, Wchler, and Rammelsberg. But if the progress 
thus far made in either the general or the special parts of the sub- — 
ject is not very large, it is at any rate enough to convince us that — 
we see with tolerable clearness the questions to which we have 
tion. ‘I'he intimate manner in which the different minerals are 
sometimes mingled, in what I may call a microscopic breccia 
building the structure of the minute spherules in some of those — 
belonging to the large group to which G. Rose has given the — 
* Probably it would be found practic to determine the iron indirectly by the 
estimation of the devel by the treatment of the aerolite with acids 
might be estimated at the same time ; even if it were all calculated as eman® 
