By Robert C. Clarke, Mark D. Merlin

Hashish: Evolution and Ethnobotany is a finished, interdisciplinary exploration of the ordinary origins and early evolution of this recognized plant, highlighting its historical position within the improvement of human societies. hashish has lengthy been prized for the powerful and sturdy fiber in its stalks, its fit to be eaten and oil-rich seeds, and the psychoactive and medicinal compounds produced via its girl vegetation. The culturally invaluable and infrequently irreplaceable items derived from hashish deeply encouraged the industrial, scientific, ritual, and non secular practices of cultures during the a while, and human hope for those commodities directed the evolution of the plant towards its modern forms. As curiosity in hashish grows and public debate over its many makes use of rises, this publication may also help us comprehend why humanity maintains to depend upon this plant and adapts it to fit our wishes.

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Milani, A. : 1983, Celest, Mech. 31, 241-291. , Fox K. : 1986, Nature 319, 386-388. M. : 1987a, Astron. Astrophys. 172, 265279. M. : 1987b, Non-gravitationaL perturbations and satellite geodesy, A. Hilger, Bristol. M. , Milani, A. : 1988, 'Fundamental frequencies and small divisors in the orbits of the outer planets', Astron. , in press. , Bristol. : 1985, private communication. A. : 1980 , Celest. Mech. 22 ,371-402. ALTERNATIVE REPRESENTATION OF PLANETARY PERTURBATIONS Carol Williams University of Florida Tampa, Florida, 33620 Abstract An at te mpt is mad e to find a representation of plan etary perturbations which does not require a Fouri er expansion.

90 , which is far from a zero slope line. Example 3: the least square fit is now made over 3 complete periods. 21. The value of a is 3 times smaller while the value of b is about 32 = 9 times smaller . The two solutions will still diverge after about 9 periods. 40 J. LASKARAND J. L. SIMON The offset at the origin P of the interval IP, P a = a + bP = - ~ b + f + T] is thus sineP + T /2) si n (T /2) (7) The fitting process is us ed to extend the solution of the complete model by the integration of the simpler model over a longer span of time.

I I . Ie. Figure 2. A remote planetary orbit around Sirius A, represented during 10 revolutions of the binary; case a: rotating-pulsating frame with origin in Sirius Aj case b : fixed axes with origin in the binary's barycenter; initial conditions are given in the text. BENEST Ii. p"ed We have considered here orbits for a lonesome planet. hould even occur. Besides, as no system is isolated in the Universe, these results may be altered in the reality by, as example, the galactic gravitational field or encounters with giant interstellar clouds or other objects.

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