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fear of the danger suggested in the letter of ‘ A Physic w, especially when 
the copiousness of the supply of these salts from other sources is considered. 
6. That, under these circumstances, it appears to me that the water pro- 
curable from any one of the three sources of supply being suitable, the 
trustees should be guided in the selection by the questions of quantity, en- 
gineering difficulties, and comparative expense, and not by the opinion of 
any physician. 7. That the present supply of water in Edinburgh is mani- 
festly insufficient, and that the poorer classes especially are not receiving 
enough to maintain them in a healthy state. 8. That should any epidemic 
disease appear among us, they will be less able on this account to resist 
contagion, or to bear up against disease if attacked.” 
Derivatives of Anthracene . — The meeting of the Chemical Society on 
December 1 was altogether taken up by Mr. Perkin, F.R.S., who read a 
very lengthy and important paper on the above subject. It is very long and 
impossible to abstract. It was a detailed account of some of the Anthracene 
derivatives, more particularly of the products resulting from the action of 
sulphuric acid on Dibrom- and Dichloranthracene. It is fully reported in the 
4< Chemical News” of December 9. 
Chemical Chairs. Appointments. — The chair of St. Bartholomew’s, vacant 
by the decease of Dr. Matthiessen, has just been given to Dr. Russell, lec- 
turer on chemistry in St. Mary’s Hospital. The chair at King’s College, 
vacant by the death of Dr. Miller, has been awarded to Dr. Bloxam, who 
formerly held the chair of practical chemistry in the same school. 
GEOLOGY AND PALAEONTOLOGY. 
Beds of Bog-Iron . — At the meeting of the American Association, Pro- 
fessor A. Winchell presented a brief note on the above subject. It related 
to the occurrence of enormous beds of bog-iron in the upper peninsula of 
Michigan, on the tributaries of the Monistique river. It occurs in a half 
desiccated bog covering several townships. It is of remarkable purity, and 
of great but unknown depth. It lies directly in the track of the projected 
railroad, intended to connect the North Pacific Railroad with the railroad 
system of Michigan. The ore can be floated down the Monistique and its 
tributaries, to Lake Michigan, in the immediate vicinity of an excellent 
harbour. This immense deposit is undoubtedly derived from the disinte- 
gration of the haematites and magnetites of the contiguous region on the 
West. The ore will possess great value for mixing with the other Lake 
Superior ores. 
Geology and Agriculture. — Owing to the Agricultural Society having 
obtained the services of Mr. Jenkins, its Reports have been more scientific 
than they were, and this is a circumstance that the Society is to be con- 
gratulated upon. In the last number of the (l Journal of the Royal Agri- 
cultural Society ” [1870, 2nd series] there is a Report on the Farming of 
Monmouthshire, by Mr. W. Fothergill, which contains a small geological 
map of the county, and also an account of the soils found upon each forma- 
tion. The Devonian rocks furnish a great variety of soils. There is a deep 
