248 REPORT— 1872. 



e. The central arm of trident, apparent origin spot No. 1. 

 e. The IST.W. arm of trident, apparent origin spot No. 1. 



0. The narrow streak forming the S.E. bifurcation in the neighbourhood of 

 the N.W. arm of the trident. 



1. The N.W. bifurcation in the same locality, a narrow streak. 



South area. S.W. of the fault crossing Plato. 

 p. A streak parallel with the south border. It was first seen by Mr. Pratt 

 on_ May 13, 1870. See Report British Association, 1871, pp. 88-91 ; also 

 History of Streak a, concluding paragraph, post, p. 267. 



South-east area. N.E. of the fault crossing Plato. 



h The sector originating at spot No. 4, of a furrowed character, as seen 

 under the most favourable circumstances. 



I A branch from the east side of the sector, running towards the south- 

 east. 



North-east area. System N.E. of the fault crossing Plato. 



/3. The streak emanating from spot No. 3. 



T). The streak emanating from spot No. 4. 



y. The streak emanating from spot No. 6. 



d The stem of the trident, its apparent origin spot No. 1. It is but 

 rarely seen. 



s. A curved streak seen by Mr. Pratt on August 28, 1869. 



North area. N.E. of the fault crossing Plato. 



.:. A slightly curved streak east of spot No. 16 ; its northern portion is 

 coincident with a. 



a. The straight streak east of Webb's Elbow. 



q. A branch from k crossing the locality of n, seen only by Mr. Pratt 

 August 28, 1869. ' 



North-west area. S.W. of the streak crossing Plato. 

 X. A straight streak nearly aligning vsdth fi (see fig. 16, p. 286). 

 fi. A shorter streak parallel with X (see fig. 16, p. 286). 

 c. A curved streak directed towards the N.W. arm of trident. 

 0. The continuation of o, west of Webb's Elbow. 

 ?'. Webb's Elbow (see fig. 1, p. 247). 

 V. A short streak parallel with Webb's Elbow, seen once only (see fig. 16, 



Streaks hut rarely seen. 



f. A short streak on the west part of the floor, seen by Elger in 1866. 



g. A long streak on the west part of the floor, seen by Birt in 1863 



h. A -short streak on the N.W. part of the floor, seen by Elger in 1866. 

 The north-eastern part would seem to be a continuation of/. 



n. A streak crossing the floor from N.N.E. to S.S.W, through spot No 1 

 seenbyBirtm 1860 and 1863, also by Pratt on April 12, 1870, and March 3,' 

 1871 (see post, pp. 281 and 282). Both in interval 96 to 108 hours. 



The above enumeration has been drawn up with an especial view to the 

 connexion existing between the spots and streaks. There are a few points 

 worth notice, particulariy as regards the streaks : one is, their appearing 

 brightest nearest the border of Plato ; another, assuming that they have 



