Some of the calculations, particularly in the appendix, no one can make without a good deal of labour. I have taken so much care about them, that I believe there can be no material error in any of them; but should there be any such errors, I am the only person who ought to be considered as answerable for them.
Mõned arvutused, eriti lisas, keegi ei saa teha ilma üsna suur töö. Olen võtnud nii palju hooli neist, et minu arvates ei saa olla olulise vea üheski neist, kuid tekib selliseid vigu, ma olen ainus inimene, kes tuleks pidada aru nende eest.