that vicinity, are however Sdentiont with the North American 
norites, whose stratified character is undoubted. _I called atten- 
has since described and bh (00 the nes “of that locality, 
which oe Ae labradorite, often coarse grained, with pyrox- 
ene and menaceanite, and is evidently, according to him, a bedd 
thew hic = (Dublin Quar. Jour., 1865, p. 94). He, it may 
ro ed, designates it as a syenite, a term which most litho- 
oe apply to rocks whose feldspar is orthoclase. 
] 
desire to call the attention of both American and European 
ier ie to this remarkable class of rocks, of which the 
norites may be regarded as the normal and typical form, in the 
toe that they may be induced to examine still farther into the 
question of the age ary | geognostical relations of these rocks in 
various regions , an to determine whether the mineralogical and 
a pep which I have pointed out are geological 
constan 
Art. XXTIL—On the cause of the color of the Water of Lake 
an, Geneva; by Aua. A. Hayss, M.D., Assayer to State 
of Massachusetts. 
THE traveler, who enters Switzerland at Geneva, always has 
his attention arrested by the beautiful azure color which the 
water of Lake Leman presents, especially when, as one looks 
into its depths, the color is in contrast with the white reflection 
of clothing below the surface, at points where the laundresses 
pursue their avocations. 
* T, at the same time, called attention to the Laurentian aspect of crystalline 
limestones of Iona, which I found in MacCulloch’s collection. Himestocen ea ‘not unlike 
logis wil at onc al thy inn tl Tasreatian tesestinne 
Sow Ya Soo je sieiwen-ptatanaa of tne-o» ‘pp ahimammes 
