――――――――――――――――――――――――――――――――――――――――+――――――――――――-+―――――――――――― A thousand, with the following increase,| Will become | Will double in thirty years | in a century| in ――――――――――――――――――――――――――――――――――――――――+――――――――――――-+―――――――――――― 5 per cent. increase in thirty years | 1176 | 426 years. 10 per cent. | 1374 | 218 15 per cent. | 1593 | 148 20 per cent. | 1836 | 114 25 per cent. | 2104 | 93,2 30 per cent. | 2398 | 79,2 35 per cent. | 2719 | 69,3 40 per cent. | 3070 | 61,8 45 per cent. | 3451 | 56 50 per cent. | 3863 | 51,3 55 per cent. | 4310 | 47,4 60 per cent. | 4791 | 44,2 65 per cent. | 5308 | 41,5 70 per cent. | 5874 | 39,2 75 per cent. | 6458 | 37,2 80 per cent. | 7094 | 35,4 85 per cent. | 7773 | 33,8 90 per cent. | 8495 | 32,4 95 per cent. | 9264 | 31,1 100 per cent. | 10080 | 30 APPENDIX. III. The Editor has been favoured with the following list of plants illustrative of the mild climate of Cornwall. The native plant of greatest curiosity is the Erica Vagans, Erica Didima of Withering, Erica Multiflora of Ray and Hudson. This plant spreads over the whole serpentine formation of the Lizard, and observes its limits almost to a foot. It is said to appear again at Clickitor near Liskeard, where the serpentine formation is also found. The Ligusticum Cornubiense, remarkable only from its extreme rarity, grows near Bodmin, in a place called Margaret’s Wood. The Tamarix Gallica grows in great abundance about the Lizard, apparently wild, but it is said to have been brought there from St. Michael’s Mount in the early part of the last century; and St. Michael’s Mount having been long a cell to Mount St. Michael in Normandy, the shrub may very probably have been introduced by the monks. It powerfully resists the sea winds, and grows freely on the banks of earth or sand surrounding inclosures near the shore. The wood is so solid as to sink in water. The Panicum Dactylon grows on the bank of gravel lying between the sea, and the road leading from Marazion to Penzance.