20 Capt. E. H. Hills. [May 10, 



towards the north-east. The anticlinal fault of Cham wood Forest, 

 so far as known, satisfies these conditions, and it is highly probable 

 that the earthquake -was caused by a slip of this fault. 



The beginning of the sound preceded that of the shock in all parts of 

 the disturbed area ; the end of the sound followed that of the shock in 

 the central district and in the neighbourhood of the minor axis, but 

 preceded it near the end of the major axis. Thus the sound ap- 

 parently outpaced the shock in the direction of the major axis, but 

 not in that of the minor axis. These time-relations of the sound and 

 shock can be readily explained if the area over which the fault-slip 

 took place were several miles in length, for the sound in all prob- 

 ability is due to small and rapid vibrations proceeding chiefly from 

 the margins of that area. 



The intensity was greatest at and near Woodhouse Eaves, and it is 

 probable that the fault-slip began in the neighbourhood of this 

 place, gradually diminishing in amount in either direction, rather 

 rapidly towards the north-west, and much more slowly towards the 

 south-east ; the rate at which the slipping advanced being greater than 

 the velocity of the earth-wave. The total length of the fault-slip may 

 have been as much as 12 miles or even more, and there can be little 

 doubt that it was continued for some distance under the Triassic 

 rocks on which Leicester is built. 



V. " The Total Solar Eclipse of 16th April, 1893. Report on 

 Results obtained with the Slit Spectroscopes/' By E. H. 

 HILLS, Capt. R.E. Communicated by the Joint Solar 

 Eclipse Committee. Received March 7, 1894. 



The parties in Brazil and Africa were both supplied with these 

 instruments, two being sent to each station. The instruments were 

 arranged to take one photograph only during the eclipse with an 

 exposure as long as possible. It was considered that the amount of 

 light available would not allow of more than one successful exposure 

 being made. Of the four resulting photographs, one of those taken 

 in Brazil was unfortunately not finished before the sun reappeared, 

 whilst the 'other shows a faint corona spectrum with a strong sky 

 spectrum on both sides, and a considerable amount of general fog 

 over the plate. 



I have been able to detect nothing of interest in this photograph, 

 for the Fraunhofer. lines overlap the corona spectrum to such a 

 degree that it is impossible to distinguish any bright lines with 

 certainty. 



The instrument employed in Africa consisted of two spectroscopes, 

 on one equatorial mounting. The first spectroscope had two prisms, 



