86 Observations on Terraces. 



C 43-59 4374 4275 4209 43-08 43-15 



H 6-96 7-33 7-37 734 6-81 7-39 



N 11-64 11-40 11-52 11-52 11-52 1152 



O 1-25 



S 36-56 



37-53 38-36 3905 3859 37-94 



10000 10000 10000 10000 10000 10000 

 The above analyses lead to the formula C 36 H 3s N 4 24 . 



Average found. Cairn lated. 



C 3n 43 06 43-29 



H 35 7 20 7 01 



N 4 11-52 11-22 



0-fS 24 38-22 38-48 



10000 10000 



Emulsine loses its capacity of reacting upon amygdaline with 

 formation of bitter almond oil and hydrocyanic acid after expos- 

 ure to a boiling temperature in solution, but retains this property 

 very distinctly after exposure in a dry state to a heat of 100° C. 

 for hours in succession. 



Berlin, Prussia, Dec. 1848. 



Art. VIII. — Observations on Terraces ; by James D. Dana. 



(Continued from vol. vii, p. 14.) 



There is one point in the history of terraces which was not 

 dwelt upon perhaps with sufficient fullness in my former commu- 

 nication, and an additional paragraph is therefore here presented. 

 But before entering upon it, I may make a few brief remarks on 

 the observations by Mr. Chambers, in a preceding part of this 

 volume. # 



In my former article, no particular kind of terraces was de- 

 scribed ; those in view were such as Mr. Chambers mentions 

 in his work, if I may judge from his descriptions, and his com- 

 parisons to the terraces of this country. The remarks offered 

 were intended simply as a statement of the effects of an elevation 

 in producing terraces of different kinds simultaneously, — a de- 

 tailed enumeration of those tests, which might prove whether a 

 deposit were marine or not, — and a notice of the mode of fixing 

 the exact value of these different tests in the cases in view; and 

 it was added that if no oil* of the tests of marine action could 

 be detected in the course of one or two hundred miles along the 

 length of a valley, we should hesitate before asserting that the 

 deposits were marine. The evidence used for other strata is no 



* Page 33. 



