320 Sir W. E. Logan on the Quebec Group, and 
probe be the means of increasing in no small degree our 
nowledge of these bodies and their derivatives. Asasubsti- 
-wax, and moreover, it is said to be rendered perfectly whit 
by the ordinary modes of wax bleaching. It might prok 
u 
purposes of cultivation—the slight degree of attention 
to insure abundant crops, and finally the ease-of extre 
the wax itself, there a to be no reason why the pre’ 
of myrtle wax should not constitute an important b 
manufacturing industry.* 
h ing investigation was undertaken at the sugg 
of Prof. Johnson, for whose guidance and assistance I here 
pleasure in expressing my grateful acknowledgments. ce 
Sheffield tory, New Haven, Feb. 3d, 1862. 7o 
Art. XXX.—Cbonsiderations relating to the Quebec Group, and 4 
_ Upper Copper-bearing Rocks of Lake Superior ; by Sit W. #. 
Logan, F.R.S., Director of the Geological Survey of Canada. 
(Read before the Montreal Natural History Society, May, 1861.) 
_ Iva communication addressed by me to Mr. Barrande on the 
fauna of the Quebec group of rocks, (this Jour., xxxi, 216,) ot 
showing that the organic remains discovered last year at Poin 
ced ig 
formation, I stated that the ase conformable sper dnt 
6 iver formation was probably 
to an overturn anticlinal fold or overlap. 
_ * In course of the preceding investiga’ tion a property of tate of sil? 
‘was noticed which I believe has not yet been fe on record, I allude agit 
