Psychologistics is a new field of study, described in my treatise on trial logic, which is available at http://vixra.org/abs/1604.0118. The current work presents ten relatively independent essays on Psychologistics, which form supplementary material to the treatise. The subject matters of these essays can be recapitulated as follows. Essay 1 addresses various trends of psychology in historical prospect; Essay 2 addresses the complete taxonomy of the senses of a man; Essay 3 is a discussion of native languages and their codes, and also of artificial (contrived) languages; Essay 4 treats special quotations and some relevant topics in greater detail as compared to their treatment in Preface of the trial logic treatise; Essay 5 addresses my solution of the problem of universals; Essay 6 addresses taxonomies of bionts, i.e. instances of hierarchal systems of irregular, or proper, classes of bionts as opposed to regular, or small, classes of objects, called also sets; Essay 7 deals with basic biochemistry including basic principles of genetic theory (theory of DNA macromolecules); Essay 8 comprises historical remarks on philosophy, logic, and psychology; Essay 9 presents formulation and proof of generalized associative and commutative laws for an abstract binary composition operator; Essay 10 comprises some general remarks on the trial logic and Psychologistics.