Swami Prabhavananda's The Spiritual Heritage of India (1962) quotes "the physicist Joseph Kaplan" several times (in the chapter on the Samkhya system). For instance:
Thus the molecule is not something which takes on successive states, but it is the states themselves. So dice are the sum of possible was in which they can fall. The principle is known as the principle of superposition. So the three gunas represent the universe, and as the three occur in various relative intensities, so the properties of things are determined.
The atomic theory is the product of the Western mind. In his native way the Western scientist generalizes the experience that one can subdivide matter until one meets an ultimate particle into an atomic theory assuming many elements. The Hindu philosopher goes much further and reduces everything to one element.
Who is/was this Joseph Kaplan (for his is a fairly common name) and did he publish any books (perhaps also on spiritual topics) by himself?