50 Reviexo of CI tav eland' s Mineralogy. 



brilliant fine-grained micaceous iron, in large masses near Bel- 

 lows' Falls ; yellow foliated blende, in Berlin, Connecticut, and 

 near Hamilton College — the latter discovered by Professor 

 Noyes ; it is in veins in compact limestone ; — red oxid of 

 titanium, often geniculated, at Leyden, in Massachusetts, dis- 

 covered by Mr. E. Hitchcock ; — red oxid of titanium, in very 

 large crystals and geniculated, imbedded in micaceous schistus, 

 at Oxford, 20 miles north from New-Haven ; — silicious petri- 

 factions of wood, abundant in the island of Antigua, recently 

 brought by Mr. Pelatiah Perit, of New- York ; — sulphuret pf 

 molybdena, at Pettipaug, and at East-Haddam, Connecticut; 

 — prehnite abundant and beautiful, in secondary greenstone, 

 at Woodbury, 24 miles north of New-Haven, discavered by 

 Mr. Elijah Baldwin ; — black oxid of manganese, in great 

 abundance, and of an excellent quality, near Bennington, 

 Vermont, and plumose mica, in a very tine graphic granite, io 

 a hill two miles north of Watertown, Connecticut. 



The introduction to the Study of Geology, deserves a 

 more extended series of remarks than it would now be proper 

 to make, after so full a consideration of the previous parts of 

 the work. 



Professor Jameson's elaborate exposition of the Wernerian 

 system, is too full, and too much devoted to a particular system, 

 for beginners : the sketches of geology contained in the systems 

 of Chemistry by Murray and Thomson, and in Phillips's mine- 

 ralogy, are two limited, although useful : the excellent account 

 of the Wernerian system, contained in an Appendix to Bro- 

 chant's Mineralogy, has, we believe, neyer been translated ; 

 and we need not say that Professor Playfair's illustrations of the 

 Huttonian Theory, De Luc's Geology, and Cuvier's Geology, 

 are not well adapted to the purposes of a beginner ; neither is 

 Delametherie's, nor has it been translated. An introduction to 

 geology was, therefore, hardly less needed than one to mine- 

 ralogy. Professor Cleaveland has performed this difficult duty 

 with great ability, and has brought this interesting branch of 

 science fairly within the reach of our students. 



Although adhering substantially to the Wernerian arrange- 

 ment of rocks, he has, ^o to speak, blended Werner's three 



