I found that, if the aperture was on the side away from the embankment, there was a decided tendency for the obelisk to jam against the opposite wall of the funnel. If, on the other hand, the sand ran out from the near side, the obelisk came down resting against the embankment wall, with its edge where the slot should be. It seems most likely that the sand was removed, not from the tunnel shewn on plate VIII, but from one on the opposite side, leading out from under the embankment. The tunnel shewn in the plate seems necessary for the proper cleaning of the pedestal before the obelisk was pulled upright. In a subsequent model, in which the side of the funnel was vertical and made of glass, I was enabled to examine the base of the obelisk and the levels of the sand during the descent. The results shewed no reason for modifying the diagram on plate VIII except in the manner mentioned above. It is possible that the sand was removed from above until the obelisk was low enough for there to be no fear of a jam; after that point had been passed, it would not matter from which side of the pedestal the sand was removed. I realise that if the model were enlarged up to full-size, the grains of sand would be at least one centimetre in diameter. It seems to me that, using ordinary sand with a full sized obelisk, the flow would be better than is the case in the model, as there would be less skin-friction with the sides of the funnel. On the other hand, there may well be factors, unforeseen by me, which might render the behaviour of the full-sized obelisk different from that of the model, so I give these results without insisting that they are a _proof_ that such a method is possible for erecting obelisks. Another point arises in connection with the funnel; this is the possibility of the _side_ walls of the funnel having been constructed vertically, the width of the funnel being only slightly greater than the width of the base of the obelisk. The advantage of this modification would be that if sand were piled on to the obelisk in the initial stages of its descent, the weight of the sand would be a great help in forcing the base down the funnel past the point where it might be likely to jam. It would, however, make the examination of the obelisk during its descent a difficult matter owing to lack of space.