From the figures given for Somerset and Wilts, it may fairly be concluded that, in this district, the value of the 'firma' was about £105. In Somerset, however, there was clearly a special sum, £106 0s 10d, on which calculations were based.

An examination of Mr Eyton's statements on the firma unius noctis in Somerset and Dorset would prove a peculiarly conclusive test of his whole system.

In the case of Somerset one need not dwell on his giving its amount for the Williton group as £105 16s 6½d, when the sum named is £105 17s 4½d, although absolute accuracy is, in these matters, essential. We will pass at once to the bottom of the page (ii. 2), and collate his rendering of Domesday with the original:

'T.R.E. reddebat dimidiam firmam noctis et quadrantem' (Domesday). 'Reddebat T.R.E. dimidiam noctis firmam et unum quadrantem' (Eyton).

Domesday gives the payment (in a characteristic phrase), as three-quarters firma noctis. Mr Eyton first interpolates a 'unum', and then overlooks the 'quadrantem', with the result that he represents the due T.R.E. as a firma dimidiæ noctis (i. 77). So far, this is only a matter of error per se. But Domesday records the commutation of the due T.R.W. at £79 10s 7d. This proves to be three-quarters of the commutation, in two other cases, for a whole firma noctis (£106 0s 10d). Mr Eyton, however, imagining the due to have been only half a firma set himself to account for its commutation at so high a figure (i. 77-8). This he found no difficulty in doing. He explained that 'this was not a mere commutation', but 'was doubtless a change which took into consideration the extra means and enhanced value of Meleborne'.

The probability is, then, that what we have called the enhanced ferm, was enhanced by something less than the gross profits we have instanced; that is, that a part of those profits, say the Burgage rents, or some of them, had contributed to the dimidia firma noctis before the commutation.

All these ready assumptions, we must remember, are introduced to account for a discrepancy which does not exist.

Great masses of Mr Eyton's work consist of similar guesses and assumptions. Now, if these were kept scrupulously apart from the facts, they would not much matter; but they are so inextricably confused with the real facts of Domesday that, virtually, one can never be sure if one is dealing with facts or fancies.

And far more startling than the case of Somerset is that of Dorset, the 'Key to Domesday'. Mr Eyton here held that Dorchester, Bridport, and Wareham paid a full firma unius noctis each, the total amount being reckoned by him at the astounding figure of £312 (p. 70)! Exeter, which affords a good comparison, paid only £18 (as render), though the king had 285 houses there: the three Dorset towns in which, says Mr Eyton, the Crown had 323 houses, paid in all, according to him, £312. The mere comparison of these figures is sufficient. But further, Mr Eyton observes (p. 93), that in 1156 'Fordington, Dorchester, and Bridport' were granted by Henry II to his uncle, 'as representing Royal Demesne to the annual value of £60'. This is an instructive commentary on his view that Dorchester and Bridport alone rendered £208 per annum. Our doubts being thus aroused, we turn to Domesday and find that it does not speak of any of these towns as paying that preposterous firma. The right formula for that would be 'reddit firmam unius noctis' (p. 84). Instead of that, we only have 'exceptis consuetudinibus quæ pertinent ad firmam unius noctis' (p. 70). The explanation is quite simple. Just as in Somerset, Mr Eyton admits, Langport and Ilchester, although boroughs, were 'interned' in groups of Royal demesne, paying the firma unius noctis, so in Dorset the boroughs were 'interned' in groups of Royal demesne. Indeed one of these groups was headed by Dorchester, and is styled by Mr Eyton the 'Dorchester group'. But he boldly assumed that 'Dorchester' must have two different meanings: