82.] Organic Physics. 



itheastern Iowa, its distribution, aspects, fossils and deposition. The authoi 



iter, F. M— Notet on the Loess. From the Muscatine Tribune (1879). 

 'his is the title of a paper read before the Muscatine Academy of Science, ] 

 ry 10, 1879. It contains a general discussion of the Iowa loess, with incitlc 



ORGANIC PHYSICS. 



BY CHARLES MORRIS. 



( Continued from Jjine number.) 



TN the life history of the Metazoa, or many-celled 



nimals, the 

 Instead of 



als. But then 



any essential respect from the results of Protozoan division. The 

 germ still separates into its constituents, which become more and 

 more polarly diverse, until a vast mass of new cells is produced, in 

 which those with male excess of vigor are just equal to those with 

 female excess. 



But in this development of a matured body from its germ, sev- 

 eral interesting features appear, which we must successively con- 

 sider. The first of these is the separation of the body into two 

 bilaterally similar halves, a result which, although partly or com- 

 pletely masked in the lowest classes of the Metazoa, is very dis- 

 tinctly declared in the higher classes. Under our hypothesis this 

 separation of the body into two similar halves has a special sig- 

 nificance. The two halves of the body are polarly distinct, being 

 respectively male and female in chemical constitution, so that the 

 body of the offspring represents that of both its parents. 



This conclusion seems to necessarily arise. If the simplest 

 animal cell be a polar organization, with acid and basic, or male 

 and female poles, then its division is a sexual separation. If the 

 two new cells continued to cohere, they would form a bilaterally 



ing may be found in an article by Professor J. D. Whitney on " The Chinese Loess 

 ™*k " in Am. Nat., Vol. XI, pp. 705-713, in which the author inclines to the sub- 

 renal hypothesis. See also the reports of the geological surveys of Illinois, Ohio, 



