336 Scientific Intelligence. 
than 200 grm. per square oer Mr. Trotter is led to sup- 
ort the conclusions of For that glacier motion is that of a 
slightly viscous mass partly bats upon its bed, partly shearing 
upon itself under the influence of gravity. egelation also plays 
a part in the aa passage of snow into ice and in the hea aling 
of crevasses.— Hrvyal Soc., Jan. 29; Nature, Feb. 5, 1885, p. bie 
a. 
11. Photographing the Solar Corona.—Mr. C. Ray Woone 
who was sent to Switzerland to saoeg ales the solar corona 
according to the method devised by D Hea ieed sums up in the 
Observatory the results thus far oblained. as follo 
1) As would be expected, the results are better: shad had been 
obtained in England, in spite of the red haze which has been 
always present round the sun, and which visitors to Switzerland 
have commented on in several of the scientific journals recently. 
(2) Results on the same day are almost, if not quite alike, both 
sap disk and without. 
The corona varies more or less from day to day. 
x The clearer the sky the better i: results. 
e series extends over a period of two months, a 
mouth’s results being free from effects that require ciiminaaond 
agneto- and Dynamo-Electric Machines, with a descrip- 
tion of Electric Accumulators, from the German of Glaser-DeCew 
by F. Kroun, and ape edited with Hees additions by PaGetT 
Hegee LL.D., ete. 1 pp. 8vo. London (Symons & Co. —The 
Specialists’ sohie ok i). This wo tg is essentially a reprodae 
n of the excellent little volume which formed No. 1 of the 
- 
a 
struction and use of the machines. ‘The auee at Ae is too 
vast in its present development to allow of being t i 
thoroughly in a book of this size, but the reader will find in this 
volume a good selection of matter and will profit from its perusa 
II. Grotogy anp MINERALOGY. 
1. Professor W. O. Crosby on the origin and a of con- 
tinents and ocean basins, (Proc. Bost. Soc. Nat. Hist. for ig 
1883; but recently eo tee ati this pape Professor “Grosby 18 
ee P 
: ica, an 
times ee Paleozoic ee nts for North America, 
roducing, in its sinking, pressure against the centres which 
resulted in causing Appalachian foldings and uplift 
