Hypothesis testing is not a straightforward matter in the fossil record and here, too interactions with biology can be extremely profitable. Quite simply, predictions regarding long-term consequences of processes observed in liv­ ing organisms can be tested directly using paleontological data if those liv­ ing organisms have an adequate fossil record, thus avoiding the pitfalls of extrapolative approaches.  Meer

Report, the editors replaced the term "speciation" wherever it occurred by "identification and quantification," or "description of abundance," or "reactivity," or "transformation" of a chemical species, according to whichever one of the four meanings the author had evidently meant to convey.  Meer

need for an interdisciplinary approach to research, although scientifically desirable and laudable, is not easily met by the individual investigator, a statement which I must now qualify lest it be taken as a faint-hearted view of the problems which confront us in this or any other field of disease-orientated re­ search.  Meer

they belong. Do communities have rights, indeed even an existence, which are not merely the hypostasis of the individual rights and existences collected in them?  Meer

for the design of control programs; in extreme cases (as dis­ cussed below, by Fine et al. , this volume, and elsewhere) it can happen that immunization programs, although they protect vaccinated individuals, actually increase the overall incidence of a particular disease.  Meer

3 There are other trends in the attempt to meld evolution and development which immodesty permits me to add. I have been concerned over the years with the selection forces which might have produced larger organisms and therefore a development of increasing complexity.  Meer

of metal interactions with subcellular biochemical systems usually either are metabolites of the system affected (porphyrinurias) or represent some specific function of a cellular system being impaired (proteinurias).  Meer

P. Marler* and H. S. Terrace** *The Rockefeller University Field Research Center Millbrook, NY 12545 **Dept. of Psychology, Columbia University New York, NY 10027, USA For the first half of this century, theories of animal conditioning were regarded as the most promising approach to the study of learning - both animal and human.  Meer

hurdle will be in the latter area. The technological hurdles will be formi­ dable but will not limit what happens: once the basic ideas are available, the technology will be developed.  Meer

will probably be clarified by the continued cooperative efforts of scientists such as those in the group that met in Berlin last September. The staff of Dahlem Konferenzen is responsible for making the meeting of this group memorably pleasant and pleasantly mem­ orable.  Meer

5) To what extent do events occurring during regeneration re­ semble those seen in development? Questions like these remain open, particularly in relation to the mammalian central nervous system and to the effects of lesions or disease.  Meer

3 of the experience of the last few generations. The group of happily unexperienced events includes large bolide impacts with the Earth. The evidence for the occurrence of such impacts at intervals of some tens of millions of years is quite convincing, and Lyell stands admonished by Hamlet: "There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy.  Meer

normal and pathological mineralization in vertebrates but also with the interesting problems involved in the formation of in­ tracellular deposits of calcium oxalate in plants.  Meer

free from any of the overtones that often constrain professional fisheries meetings. The present volume is the result. This volume aims to be useful as an appraisal of the state of the art by a mixed collection of insiders and outsiders.  Meer

and how the known vertebrate homologues of these genes are expressed normally in differentiation and proliferation pathways as well as abnormal­ ly in well-defined lymphomagenic and other oncogenic pathways.  Meer

the oleic acid on a live and wriggling sister or mother and refrain from evicting her from our hive. But does the occur­ rence of unintelligent behavior suffice to demonstrate the total absence of mental experience under any circumstances?  Meer

3 and a fraction mayor may not respond to treatment. On the behavioral level, animal research shows that a variety of experimental conditions can induce de­ pression.  Meer

usage of the terms substrate and substratum. A substrate (pI.: substrates) is a material utilized by microorganisms, generally as a source of energy. A substratum (pI.  Meer

very important, especially the comparison of vertebrate and invertebrate transduction mechanisms. The workshop was very successful and the outcome of the discussions proved it worth the effort.  Meer