l88 FERTILISERS FROM THE OCEAX. 



Going- into figures, and taking tlie value assigned to Tricalcic 

 Orthophosphate, Potassic Oxide and Nitrogen in Hall's " Fer- 

 tilisers and Manures," page 340, et seq., we obtain the following, 

 results : — • 

 I. Sea Grass. 



Phosphoric Oxide = .965 per cent. 



Tricalcic Orthophosphate = 2. 242 at is. iid. per 



unit per cent £0 4 2- 



Potassic Oxide = 3. 41 4 at is. 4d. per unit per cent. o 14 o 



Nitrogen = 1.648 at 12s. per unit per cent o 19 Q' 



\'alue of one ton = £1 18 o 



Algae. 

 Phosphoric Oxide = .8or. 

 Tricalcic Orthophosphate = 1.86 at is. iid. per 



unit per cent £0 3 6 



Potassic Oxide=i.63 at 4s. id. per unit per cent. o 6 S 

 Nitrogen = 1.59 at 12s. per unit per cent o 19 o 



Value of one ton = £1 9 2. 



Fl'Cus. 

 Phosphoric Oxide = 2.326. 

 Tricalcic Orthophosphate = 5.400 at is. 11 d. per 



unit per cent £0 10 4 



Potassic Oxide = 1 1.045 at 4s. ^*^'- P^^ '•'"'^ percent. 251 

 Nitrogen = .522 at 12s. per unit per cent o 6 2 



\'alue of one ton = £r^ i 7 



It appears from the above that a ton of the air dry " Sea 

 Bamboo " has a value of over ;^3 sterling, which the farmer in 

 the coast districts can cart to his farm at a very small cost. 



The " Sea Grass " and " Algae " ha\"c a value which also' 

 must appeal to the farmer, and if he would only collect the bones 

 in his household, let his servant crush them in an ordinary iron 

 mortar, and mix them with the sea-weeds, he would have with 

 little outlay secured a very powerful manure which would greatly 

 augment the returns of his lands. 



UNIT OF RADIOACTIVITY.- The Commission ap- 

 pointed by the International Congress of Radiology, which \\as 

 held at Brussels last September, has decided to call the quantit}' 

 of emanation in equilibrium with a gramme of the element radium 

 a citric, and to adopt an international radium standard, which is- 

 to be preserved at Paris. 



INTERNATIONAL ASSOCIATION OF SEISMOLOGY 



Delegates from twenty-three^ countries belonging to the Interna- 

 tional Association of Seismology will meet at Manchester during 

 July under the presidency of Prof. A. Schuster, Ph.D., F.R.S., 

 F.R.A.S. Dr. Schuster will be glad if anyone interested in the.- 

 subject of seismology will communicate m ith him. 



