90 REPORTS ON THE STATE OF SCIENCE. 
December 10 to 17.—10th, 13h., 12th, 
10h., heavy singeings; 13th, 17h., to 15th, 
Sh. 30m., heavy singeings. Luminous 
band opposite top small hole 13th a.m. 
to 16th noon. 
December 24 to 31.—24th noon to 19h., 
intermittent singeings; 25th, 0h., to 29th, 
15h., same; 29th, 21h., to 30th, 15h., 
same. A few spots. 
December 3\ to January 7,1907.—31st, 
12h., to January Ist, 6h., occasional singe- 
ings which continue at intervals of several 
hours up to January 3. January 4th, 
3h., to 5th, 11h., intermittent singeings, 
only one or two spots. 
January 22 to 29.—22nd to 28th, heavy 
singeings, most of time weather cold and 
frosty. Running along the top of singe- 
ings is a very fine line. 
January 29 to February 5.—February 
Ist, 2h., slight singeings to 11h, 
March 19 to 25.—19th, 10h., 16h. 
slight singeings. 
March 25 to April 1.—Mere trace of 
singeings, 30th, 16h. 
April 1 to 8.—1st, 11 A.M., slight singe- 
ings repeated at long intervals during 
week, 
December 8 to 15.—8th, 14h., luminous 
band, dotted lines; 9th to 10th, strong 
singeings, and 13th to 14th; 11th, very 
large spot 10h. 30m., 15 mm. diameter. 
December 18 to 21.— Luminous bands, 
No records until March 18. 
March 18 to 24, 1907.—Bands very 
faint. 
March 23 to 28.—Two faint bands. 
April 2 to 6.—2nd to 5th, luminous 
band with a chain-like pattern. Slight 
singeings 3rd, 12h., at intervals to 5th, 
12h. From 8rd, 12h., to 4th, 12h., groups 
of large spots. 
April 6 to 11.—From 6th to 10th 
intermittent singeings. 
April 11 to 17.—12th to 17th, bands 
very faint. 
April 8 tv 15.—Neither singeings, 
spots, nor bands. For most part weather 
showery and dull. 
April 15 to 22.— Very slight singeings. April 17 to 23.—Two dark bands. 
18th to 19th, slight singeings. 
April 22 to 29,—Clear sheet. 
The Results. 
The sheets of paper were changed once a week and were always 
found to be very damp. When they were developed, certain sheets were 
perfectly clear whilst others were partly or entirely marked with dark 
bands, black lines, round black spots, or semicircular spots along the lower 
edges. These latter, from their appearance of having been burnt, have 
been called singeings. 
I. Dark Bands.—Those have not been very numerous, but were found 
four times out of twenty-nine sheets from Shide, eleven times out of twelve 
sheets from Camborne. They were never found on fourteen sheets from 
White Pit Lane. On removing the instrument at the latter place it was 
found that the zine plate had so far buckled that the bromide paper may 
have been a quarter of an inch from the chalk. Those from Pan Chalk 
Pit were about one inch in width, being darker in the centre than near 
their edges. They occurred opposite the triangular hole, the edges of which 
touched the chalk. Those from Camborne varied much in character. In 
certain cases we appear to have had at least three bands, apparently 
coinciding with the three holes in the zinc plate interposed between the 
film and the rock surface. In some of these bands there were hard black 
lines broken along their length and made up of black spots. 
