 557  465. When «educated neurons» can be unequivocally identified the search for information storage mechanisms is likely to involve a molecular or submolecular level of organization. The study of neuronal specificity in embryogenesis may offer some analogical models on which to build appropriate hypotheses. 466. In practice the solidification of pure metals is influenced to a great extent by what may be generally described as external conditions. When solidification is not influenced by temperature gradients arising from the method of cooling all the crystals in the solid metal exhibit a marked similarity in size and shape. 467. At this point of the experimental work, however, sufficient evidence had been accumulated to indicate very strongly that the innate resistance of mice to the infectious agents did not depend upon whether mice were predisposed to leukemia, but was determined by other genetic factors characteristic of each strain of mice. 468. The molecules are involved in a permanent irregular motion. We call it «thermal motion», since we perceive this motion as the phenomenon of heat: the faster the motion, thehotter the body, the rising temperature being simply interpreted as the increase in the kinetic energy of separate molecules. 469. The satellite provided a communication path only when it was mutually visible at the two terminal stations. On an average day 6 of the satellite's 12 orbits around the earth passed through the area of mutual visibility. The average useful time per 572 HacTb pass was 12 minutes, the maximum being about 16 minutes. 470. Our first experiments compared the effects of chlorproma-zine and imipramine. The results were somewhat disappointing, as both drugs were found to inhibit selfstimulation. Chloropro-mazine was about ten times more potent as an inhibitor than imipramine. These results coincided with published pharmacological findings. 471. The first electronic computers were designed, less than twenty years ago, for mathematical work in science and engineering. During the last ten years they have been applied much more widely. The point to bear in mind is that the electroniccom-puting machine, in whatever field it may be applied, is a computing device. 557 |
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