88 Mr Purvis, The influence of very strong 



Wave-length 



\ 3757*0. This strong diffuse line seems to be widened, and one or 

 two plates also show a weak ill-defined doublet or re- 

 versal. 



3595*7. This line shows a widening, but no separation could be 

 made out when the calcite was interposed. 



3510*5. The line showed distinct widening; and on analysing with 

 the calcite, it seems to be a triplet, with the two outer 

 members vibrating parallel, and the inner one perpen- 

 dicular, to the lines of force. 



3396 '7. There is a widening, but no separation could be made out 

 on interposing the calcite crystal. 



3075*7. There seems to be a widening, but when the calcite is 

 interposed, the light is too weak to affect the photo- 

 graphic plate. 



3067*1. A strong line with diffuse edges and well marked reversal, 

 even when the spark is normal. In the magnetic field 

 each side of the reversal seems to be divided into two, 

 and the appearance on the plate is of four lines, with 

 the two outside members rather diffuse on the outer 

 edges, and the two inner members much sharper. 



3023*8. The line gives a widened doublet or reversal. 



2992*2. This weak line shows a distinct widening. On analysing 

 with the calcite, the two outer components vibrate per- 

 pendicular, and the inner one parallel, to the lines of 

 force. 



2988*1. A widened doublet or reversal. 



2937*5. The line is distinctly widened. On analysing with the 

 calcite, it seems to be a triplet, with the two outer 

 components vibrating perpendicular, and the inner one 

 parallel, to the lines of force. 



2897*2. There is a distinct widening. On analysis, it appears to 

 be a triplet, with the two outer components vibrating 

 perpendicular, and the inner one parallel, to the lines 

 of force. 



2779*3. \ Both these lines seem to be slightly widened, but they are 



2627*0./ too weak to analyse with the calcite. 



Of the lines divided into triplets, those arising from 412T2, 

 2992*2, 2937*5, 2897*2, show that the two outer members vibrate 

 perpendicular, and the inner one parallel, to the lines of force. 

 Whilst of the triplet arising from 3510*5, the two outer members 

 vibrate parallel, and the inner one perpendicular, to the lines 

 of force. 



Lead. 



e stron 

 4245*3./ frangible side ; and both show distinct widening. 



4386* 4.) Both these lines are strong and nebulous on the less re- 

 " 5-3./ 



