196 Miscellanies. 



The formula indicated by the above result is, (CNK)S3 4-3A1 S' -f 7Aq; 

 and it may be noticed, that while this formula indicates one atom of sili- 

 ca and one atom of water, 7nore than that for chabasite, the formula which 

 analysis of levyne, a mineral also nearly allied to chabasite in a chemical 

 view, suggested, shewed one atom of silica and one atom of water, less 

 than in chabasite ;* and that in gmelinite, bisilicate of alumina is asso- 

 ciated witK tersilicate of lime and alkalies ; in chabasite with bisilicate ; 

 and in levyne with silicate of these bases, as appears from the formulae : 



(CNK)S3_j-3Al S^+7Aq. Gmelinite. 



(CNK)S=^+3A1 82+ 6Aq. Chabasite. 



(CNK)S +3A1 S^+5Aq. Levyne. 

 Mr. Connell continues to remark, I have much less expectation that 

 the chabasite formula will ever be found to embrace levyne, because the 

 proportion of silica and that of alumina, actually found in the latter min- 

 eral, differs in a marked manner, and in opposite directions from those 

 in chabasite ; while in gmelinite, the difference is much less considerable, 

 although still excluding the chabasite formula. 



23. Prof Owen on the Fossil Animals collected hy Mr. Charles Dar- 

 win, (from the Zoology of the voyage of H. M. S. Beagle during the 

 years 1832 to 1836. Part first. Fossil Mammalia.) — "It is remarkable 

 that all the fossils collected by Mr. Darwin belong to herbivorous species 

 of mammalia, generally of a large size. The greater part are referable 

 to the order which Cuvier has called Edentata, and belong to that subdi- 

 vision of the order (Dasi/podidoe) which is characterized by having perfect 

 and sometimes complex molar teeth, and an external osseous and tessu- 

 lated coat of mail. The megatherium is the giant of this tribe, which at the 

 present day is exclusively represented by South American species, the lar- 

 gest (Dast/pus Gigas, Cuv.) not exceeding the size of a hog. The hiatus 

 between the living species and the megatherium is filled up by a series of 

 armadillo-like animals, indicated more or less satisfactorily by Mr. Dar- 

 win's fossils, some of which species were as large as an ox, others about 

 the size of the American Tapir. The rest of the collection belongs, 

 with the exception of some small Rodents, to the extensive and heteroge- 

 neous order Pachydermata ; it includes the remains of a mastodon, of a 

 horse, and of two large and singular aberrant forms, one of which con- 

 nects the Pachydermatous with the Ruminant order ; the other, with 

 which the descriptions in the following pages commence, manifests a close 

 affinity to the Rodent order." 



The first fossil animal mentioned by Professor Ovi^en is named Toxo- 

 don Platensis, which he describes as a gigantic extinct mammiferous 

 animal, referable to the order Pachydermata, but with affinities to the 



•" Lond. and Edinb. Phil. Jour., V, 40. 



