APPENDIX. 



719 



" Ft now remains to give the constitution of the precipitate of fluorides and phosphates. 

 The results annexed are calculated for a hundred parts of the precipitate. 



Silica, 

 Lime, 

 Magnesia, 

 Fluoride of calcium, 

 Fluoride of magnesium, 

 Phosphate of magnesia, ' 

 Alumina (and iron), 

 Oxide of iron, 



Silica, 

 Lime, 

 Magnesia, 

 Fluoride of calcium, 



Fluoride of magnesium, 



Phosphate of magnesia, 

 Alumina (and iron), 

 Oxide of iron, 



Phosphate 

 of lime. 



te ) 

 . ) 



VI. 

 5-35 



7-17 



0-49 



4-05 



,_g- Fluoride 

 of mag. 

 16-30 

 35-00 

 27-39 



VII. 

 11-0 

 25-9 

 0-3 

 15-0 



23-2 



4-7 

 19-4 



VIII. 

 30-01 

 17-45 

 24-57 

 0-85 



4-31 



0-32 

 22-49 



V. 



23-74 



35-01 



1-35 



8-88 



20-44 



3-46 



7-12 



IX. 



8-70 

 16-74 

 45-19 



0-71 



2-34 



0-34 

 25-97 



" The foregoing results show that, contrary to the expectation when the research 

 was commenced, fluorine is present in much larger proportion than phosphoric acid. 

 The silica exists in the coral in its soluble modification, and probably is united to the 

 lime. The free magnesia existed as carbonate, and was thrown down as caustic mag- 

 nesia by the lime-water. Some small portion of lime was probably thrown down as car- 

 bonate, in spite of every precaution to the contrary. Only in two or three instances, 

 however, was there any effervescence on the addition of chlorohydric acid to redis- 

 til ve it. 



"It need hardly be said, that the existence of all the matters noted in these analyses in 

 sea water, is a just inference ; but this subject, as well as the important geological in- 

 ferences, which may be drawn from the results now presented, will be fully discussed on 

 another occasion. 



"My warmest acknowledgments are due to my friends and pupils, Messrs. D. Olmsted, 

 Jr., and T. S. Hunt, who have zealously aided me in the laborious parts of these investi- 

 gations. 



" B. SlLLIMAN, Jli. 

 " Yale College Laboratory, Dec. 16th, 1845." 



Radiated Structure of the Lower Animals. p. 107. 



In the remark that a radiated structure characterizes the simplest .forms of animal life, 

 we do not intend to imply, that it is apparent in all these forms. As stated, in connexion, 

 the vegetable kingdom affords us examples of the great variety of structures, which may 

 result from simple cellule developement. The cellules may grow in simple lines or 

 spreading plates, and endless shapes may proceed from them under all their possible mo- 



