ON THE VOLCANIC PHENOMENA OF YESUYIUS. 403 
the largest were found to weigh 720 grammes, the heaviest one being 
above 200 grammes, or say 74 ounces, which is enormous, considering 
the distance of Capri from the neighbourhood of Pianura. Associated 
with these rock fragments I found ancient archaic pottery and stone 
implements, but could find nothing very definite as to their position relative 
to these superficial deposits. 
Tuff-quarries of Fajano.—After waiting three years, the tuff cutting 
has again reached a section that I had admired during that time and 
wished to examine more minutely, for it is the most perfect of the 
Vesuvian deposits which overlie the pipernoid tuff in the neighbourhood. 
The following are the details of this valuable section from below 
upwards :— 
Grey tuff, quarried down for at least . : 4 : - 20°00 m. 
PHASES IIE, IV., AND V. 
Gritty brown bed, with very few and small fragments of rolled 
pumice. In some spots it is finely BCE TY and 
passes up into the next . . 020m. 
Brown soil with indistinct plant markings and a 1 few frag- 
ments of pumice F . : : : . 125m. 
Pumiceous bed with a few lava lapilli ‘ 5 : . . 035m. 
PHASE VI., PERIOD 1. 
Regularly stratified vesicular compacted dust bed . . 9:10 to 0°20 m. 
Very markedly stratified deposit of greyish black compact 
lapilli passing up into next 5 . 035m. 
Fine and coarse stratified vesicular compacted dust passing 
upintonext . - 5 . : : 5 : - 0°35 m, 
PuAse VI., PERIOD 2. 
Yellow pumiceous sand with fragments of rolled pumice at 
bottom . c : 4 * “ 2 3 ; » 180m. 
PHASE VI., PERIOD 3. 
Fine white pumice in very regular bed with little accessory 
material . é : - 025m 
The same, but with aTeu accessory material : : 0:18 m 
Fine lapilli of accessory materials of last : : 10: 20 to 0°35 m 
? Yellow pumiceous soil . 210m 
PHASE VI., PERIOD 3, ? AND PHASE VII. 
White pumice . : : : - - : : é . 050m. 
Vegetable soil . : : : : 4 : = 
Ina neighbouring quarry Phase VI., Period 4, is well represented, but 
the section has been for some years inaccessible, and I have not been able 
to examine the relationship of the upper to the lower portions. In many 
points of the above detailed section blocks of limestone are included 
which have no doubt rolled down from the mountain above, just as they 
did during the deposition of the subjacent pipernoid tuffs. They are 
subangular and porous on the surface in consequence of the action of 
percolating waters. 
The great main-sewer works.—Returning again to the neighbourhocd 
immediately to the W. of Naples, we meet with the sections exposed in 
cutting the new main sewer, which will carry the cloacal waters across 
the Phlegrean Fields to the Gulf of Gaeta: That portion which runs 
nearly parallel to the old and new grotto tunnels to the W. of Naples, so 
Depe2 
