I do not apprehend that the different magnitude of the different fibres of the same fleeces is any _objection_ to the use of the instrument; on the contrary, it possesses the singular advantage of detecting at once the inequality where it exists, and of giving the mean dimensions of the whole at the same time where the difference is not too great. I have mixed together, for example, two small specimens, which measured separately 21 and 31. The mixture, though evidently irregular, gave the dimensions of about 24, varying from 23 to 27, according to the part of the lock which was to be examined, and this is surely a much greater inequality than can ever exist in any _contiguous_ part of the same fleece. But, however this may be, the fact is that the circumstance does not actually destroy the validity of the indications of my micrometer, as I shall further exemplify to you by an account of my examinations of some specimens of the finest wool, with which I have been favoured by Mr. H. Sheppard, an ingenious manufacturer at Frome, Somersetshire. You are, perhaps, better acquainted than I am with the history of Mr. Western’s flock, which stands in so elevated a situation between the Saxon and the Spanish productions. _Specimens of Wool from Mr. Sheppard, as measured by the Agricultural Thermometer._ Grey beaver wool No. 11½ to 12 Angola about 14 Prime Vigonia 14½ Foreign coney 15 American rabbits 15 Yellow rabbits 15 Scotch hares 15 Siberian hares 15, 16 British coney 16 Finest seal about 18 Alpaca (a single long hair) 18½-20 Goats 19 Saxon 20 Peruvian black 21, 22 Mr. Western’s Southdown, ‘reckoned the finest in the kingdom’ 23½ Lioneza 24-29 Peruvian light brown 29 Peruvian dark brown 31 Dust of the puff-ball (_Lycoperdon borista_) rubbed on glass, very distinct, giving about 1/12000 inch diameter 3½ APPENDIX III. TABLE OF THE INCOME AND EXPENDITURE OF THE ROYAL INSTITUTION TO 1814, _OMITTING SHILLINGS AND PENCE_.