_Expected results_: a single muscle twitch. _Obtained results_: a beautiful nerve twitch. (Explanation: Eyesight? How can _nerves_ twitch?)?? 3. _Hypotonic hemolysis_: _Expected results_: red blood cell destruction. _Obtained results_: crenation. (Explanation: switched salt solutions _unconsciously_)????? 4. _Curarized muscle preparation_: _Expected results_: a synaptic block with no response of nerve when stimulated. _Observed results_: a typical strychnine response, violent _tetanus_, et cetera. (Explanation: again, I switched bottles)???? 5. I shall avoid the obvious mention of mishaps with mechanical or electrical pieces of equipment. I assure you there were similar deviations in initial attempts. Since I realize that you are preparing a paper on _Memory Registers: Stimulation Criteria_, for the VIth Annual International Meeting of the Society of Theoretical Biomathematicians in London, and are short of time, I shall avoid going into the same kind of detail as the above for other Biology Labs, and get into the real heart of the thing ... the research problem. (After all that is what both of us are interested in.) By the way, please send me a reprint of the paper when it comes out. I guess I am really hepped up on this, because I've just got to point out for emphasis other incidences usually of a type that involved missing a whole organ in dissections or a tissue structure in histology only on the _first_ study, and then re-reading the assignment--after knowing what to look for--and _subsequently finding it exactly where it is said to be_. (Ever hunt for an unknown quality--or quantity?) _So it was there all the time_, sloppy technique? Or is this branching at a control point? _cf._ LC: C. vs. B. p. 251. To get back to my thesis research, the pieces of equipment that I have been using in the research are fairly standard in physiological research: a Beckman spectrophotometer, a Coleman photometer, a van Slyke amino nitrogen apparatus, a Warburg respirometer, pH meters, Kjeldahls, Thunbergs, et cetera. Mostly, I'm in the process of getting used to them. Also there is a high voltage X-ray generator, U. V. source and other equipment for irradiation purposes. We also have an A. E. C. license so that we can get at least microcurie amounts of the usual isotopes for radioautographic work.