But, it being necessary to make the nature of sensation a little understood; and to make the difference between the QUALITIES in bodies, and the IDEAS produced by them in the mind, to be distinctly conceived, without which it were impossible to discourse intelligibly of them;-I hope I shall be pardoned this little excursion into natural philosophy; it being necessary in our present inquiry to distinguish the PRIMARY and REAL qualities of bodies, which are always in them (viz. solidity, extension, figure, number, and motion, or rest, and are sometimes perceived by us, viz. when the bodies they are in are big enough singly to be discerned), from those SECONDARY and IMPUTED qualities, which are but the powers of several combinations of those primary ones, when they operate without being distinctly discerned;
Baina lan hori beharrezko izanik sentipenaren izaera pixkatxo bat ulertarazteko eta gorputzetan dauden koalitateen eta berauek gogamenean eragindako ideien arteko aldeak markatzeko eta behar bezala bereizirik bururatzeko, hori gabe ez bailegoke horietaz ulergarriro mintzatzerik, espero dut barkatuko zaidala filosofia naturalean zehar egindako saialditxoa, gure ikerketa honetan beharrezko baita koalitate lehen eta errealak, gorputzetan beti daudenak (hau da, solidotasuna, hedadura, irudia, kopurua eta higidura edo atsedena, guk batzuetan, hau da, koalitate horiek dituzten gorputzek guk horiek banan bereizteko bezain handiak direnean, hautematen ditugunak), besteetatik bereiztea, hots, bigarren eta hartakotzat harturiko koalitateetatik, hauek lehen koalitate horien konbinazio diferenteen ahalmenak besterik ez baitira, guk argiro identifikatu gabe dihardutenean.