REVIEWS THE GREAT DESERTS OP NORTH AMERICA. A^ 



Taking the mean composition as given above, and calculating the 

 weight of FeO corresponding to the 23.25 p. c. of Fe^O^, we obtain 

 20.92. Adding this to the FeO, and correcting the whole to 100 

 parts, the analysis reads as follows : — 



Oxygen : 



Si02 .. 30.47 15.81 



FeO .. 53.66 .... 11.91^ 



MnO .. 1.40 31 V16.33 • 



CaO .. 14.47 .... 4.I1J 



Although these values do not come out exactly equal, they lead 

 evidently to the common chrysolite formula 2 (RO), SiO^. If 

 we adopt, consequently, the assumption on which the above calculation 

 is based, the Lievrite falls naturally into the mineralogical group to 

 which it undoubtedly belongs ; whereas on the other view, founded 

 on the bare results of analysis, not only does the atomic constitution 

 of the mineral remain uncertain, but its composition fails to harmonize 

 with its physical characters and conditions. The suggestion, there- 

 fore, embodied in this brief notice, may not be found altogether 

 unworthy of consideration by those engaged in the study of mineral 

 analogies. 



REVIEWS. 



Seven Years' Residence in the Great Deserts 0/ North America. By 

 the x\bbe Em. Domenech, Apostolic Missionary ; Canon of Mont- 

 pellier, Member of the Pontifical Academy, Tibernia, and of the 

 Geographical and Ethnographical Societies of France, &c. Illus- 

 trated with , fifty-eight wood-cuts, by A. Joliet, three plates of 

 Ancient Indian Music, and a map showing the actual situation of 

 the Indian Tribes, and the country described by the author. 2 

 vols., 8vo. Longman & Co., London. 1860. 



From the days of England's first prose writer and earliest of literary 

 travellers. Sir John Mandeville, the wonders of unknown lands have 

 been an unfailing source of the marvellous. In his time, though the 

 New World was still among the marvels of the future, j'^et " Tartaric, 

 Persie, Ermonie, Libiye, Chaldee, Etiope, and Ind the Less and More, 

 where dwellen many divers folks, and of divers shapes of men," were 

 all in that pleasant condition of misty obscurity which allowed ample 



