430 Scientific Intelligence. 
the iron mines of the state as 30 tons in 1867, w in the 
furnaces 36,919 tons of anthracite pig-iron, 9,000 tons of charcoal 
pig-iron, and 5,980 t of bar meries and forges 
were produced the same year. Of zinc-ore, Sussex County pro- 
duces 25,000 tons per annum, which is manufactured into white 
oxyd and spelter, yielding 7,000 tons of oxyd, and 500 tons of me- 
tallic zine. Prof. Cook estimates the total amount of zinc-oxyd 
e 
T. A, Conrad ; of the Extinct Mammals and Reptiles, by Prof. 
D. Cope; of the Minerals, by Rev. E, Seymour; and of the living 
page 286, Mr. C. A. White heads an article with “ Are Unios sensi- 
tive to light?” He i 
= sede subject, and he seems to be under the impression that his 
ontde: was pretty fully stated. It will be found in my paper that 
nat 2 . _ 
terminal point of the tentacula may be observed to be rounded 
and furnished with at least the spipenrasine of aneye and that I 
