Telesio writes in the beginning of the Proem of the first book of the third edition of "De Rerum Natura Iuxta Propria Principia Libri Ix"... "That the construction of the world and the magnitude of the bodies contained within it, and the nature of the world, is to be searched for not by reason as was done by the ancients, but is to be understood by means of observation." ("Mundi constructionem, corporumque in eo contentorum magnitudinem, naturamque non-ratione, quod antiquioribus factum est, inquirendam, sed sensu percipiendam.") This statement, found on the very first page, summarizes what many modern scholars have generally considered to be Telesian philosophy, and it often seems that many did not read any further for on the very next page he sets up his hot/cold theory of informed matter, a theory that is clearly not informed by our modern idea of observation. For Telesio, observation ("sensu percipiendam") is a much larger mental process than simply recording data, observation also includes analogical thought.