216 Scientific Intelligence. 
quence of our imperfect knowledge of the laws of such induced 
currents, finds no confirmation at all in the above sarge ments. 
(2.) Absolute measurements of resistance can with the means 
of galvanic observations nowadays at our disposal, be carried out 
= such exactness and certainty “ can only be attained in few 
rtments of physics. The notion widely accepted — 
phioiieiate: that absolute measurements of resistance belong t 
ists, supplied with the most perfect instruments and _ localities, 
will not be able to bt abaokite resistance measurements that 
sensiién of experiment. rdi Peter these me 
urements can be effected with tolerable accuracy with en scant 
means ro in moderately equipped localities,”— Phil. Jan., 
1878, J. Ts 
13. i ie Srom the Chemical Laboratory of the Johns — 
kins ae Nos. 4-8, 22 pp. 8vo. Baltimore, Decem 
n the oxidation of Recnaishpdeskeans and of ee 
substitution-products, b N. Morse and L Remsey; No. 5 
MSE» ’ 
n of xylenesulphonic acids, by M. W. Inxs and I. 
— N; No. 6, on acetylamidophenols, by H. N. Morse; No. 7, 
a correction, by 'L Remsen ; ; No. 8, a Lecture-experiment, id. 
II. GroLocy AND MINERALOGY. 
1, Annual Report of the Wisconsin Geological — for the 
year 1877; by T. C. CaampBertatn, Chief — ae — Besides valu- 
able notes on the local geology of portions of a ‘State, this 
Report contains brief descriptions of new Bitutibe fossils of Wis- 
consin. The Potsdam sandstone afforded the species Bellerophon 
antiquatus, and new — of each of the following genera of Trilo- 
bites: Conocephalites, Crepicephalus, a is, Agraulos, Ario- 
nellus and Eilliptocephalus ; and the Lower magnesian limestone 
trilobites, of the genera Dicellocephalus (omer Bathyurus of Bill- 
oe and I/lenurus, beside Mapeigakabit, and s species of Sceevogyr4, 
ee and Leptena. A —_ - new species also are 
who had one of the assistant pane ra of the meee 
Cislogtiade Survey o <8 : nnual Report of 
i. : H. © , State G or the year 1877 .—The final 
yield of clay in some parts is 10,000 tons an acre, and single acres 
ave egree 40,000 tons ; a ina — year 265, ness tons 0 
