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‘comma in form, having a circular head, produced on one side into a 
long spirally curving extremity. And others seem like tornadoes in 
the heavens, whose currents rushing spirally about a center car 
no known 
laws of force have hitherto been found sufficient to explain the strange 
mode of aggregation of worlds exhibited by nebule. Prof. Alexander 
has undertaken to review and compare these various forms, and en- 
deavors to trace their correspondence with the nebular theory, extend- 
i ifying it so as to embrace the universe. He concludes that 
spheroidal form, takes up the classes of nebula in order, and points 
out the processes of development through which they may be supposed 
tohave passed. He considers first those whose original form was a 
5. Chemical Field Lectures for Agriculturists; by Dr. Juxis 
DotPHus Sréckuarpt, Prof. in the Royal Acad. of Agric., at Tha- 
rand. Translated from the German. Edited with notes by James E. 
hed. CHER. 2 . 
Prof. Stéckhardt’s waite aba of Lectures or Chapters on practica 
‘Subjects connected with Agriculture—viz. : the Nourishment of Plants 
» Principles of Human Physiology, with their chief applications to 
Psychology, Patholouy, Pisrapeulice, Hygiene and Forensic Medi- 
ane; by Wu. B. Carventer, M.D., F.R.S. *.GS., 
*tysiology and Comparative Anatomy in the University of London,. 
Pood the fourth and enlarged London edition, 
enter’s Human Physiology is too well known and too highly ap- 
lated to need poe ee This new edition by Lea and Blan- 
Stcoxp Seems, Vol: XV, No. 44—March, 1853. 39 
