The idiom referred to in the title, “don't throw out the baby with the bath water,” instructs us to keep what is essential and to only throw away what is inessential. Bathing babies has the well-being of the child in mind, the end result of which is cleanliness. Efficiency in the task of cleaning is secondary. No one would throw away a baby when draining the baby's bathwater. Somewhat analogously, science and philosophy each have the goal of the attainment of (...) truth in mind. Part and parcel of this search for truth has been the attachment of being parsimonious, especially since William of Ockham. If the goal is truth, then one cannot get lost in the pursuit of parsimony, therefore losing the truth. The goal of finding the truth must remain intact; the method of parsimony at best remains subservient to the attainment of truth. Hans Jonas believed this regarding truth and pursued the criticism of reductive materialism as part and parcel of his research program in philosophy of biology and philosophical anthropology beginning in 1950. In his mind, reductive materialism, as it was practiced, involved the pursuit of parsimony at the cost of the truth through neglect of the purpose-driven conscious life of the subject. In this article, I expose and defend the recovery of certain elements of Aristotelian biology by Professor Hans Jonas. In the process, I show how Jonas was among the early authors writing on the philosophy of biology and defending ontological essentialism and purposefulness in organisms against reductive materialism and the relentless pursuit of the unity of the sciences. Along this line, I position Jonas among the arguments made regarding teleological explanations current in the philosophy of biology. First, I explain and defend Jonas's thesis that a full understanding of organisms requires recognizing an ontological essentialism regarding organisms. Secondly, I explain and defend Jonas's forward looking and backward looking teleological conceptions of activity insofar as it concurs directly with the conscious experience of life for humans, while situating it within the mainstream of philosophy of biology. Last, the importance of this recovery of Aristotelian concepts highlights Jonas's position as an early proponent of non-reductive materialism. More importantly, his thought forces us to recognize that in the pursuit of truth we must use parsimony well. We should take extreme care to preserve the truth; we should not throw out the baby with the bath water. (shrink)

The category of ‘organism’ has an ambiguous status: is it scientific or is it philosophical? Or, if one looks at it from within the relatively recent field or sub-field of philosophy of biology, is it a central, or at least legitimate category therein, or should it be dispensed with? In any case, it has long served as a kind of scientific “bolstering” for a philosophical train of argument which seeks to refute the “mechanistic” or “reductionist” trend, which has been perceived (...) as dominant since the 17th century, whether in the case of Stahlian animism, Leibnizian monadology, the neo-vitalism of Hans Driesch, or, lastly, of the “phenomenology of organic life” in the 20th century, with authors such as Kurt Goldstein, Maurice Merleau-Ponty, and Georges Canguilhem. In this paper I try to reconstruct some of the main interpretive ‘stages’ or ‘layers’ of the concept of organism in order to critically evaluate it. How might ‘organism’ be a useful concept if one rules out the excesses of ‘organismic’ biology and metaphysics? Varieties of instrumentalism and what I call the ‘projective’ concept of organism are appealing, but perhaps ultimately unsatisfying. (shrink)