KELP AND ROCKWEED. 



347 



Potassium oxide 

 Calcium oxide ^ 

 Magnesium oxide \ 

 Ferric oxide 

 Saud, &c. 



Per cent. 

 .19 



.9 



2.15 



47.46 



This material can to some extent be used with advantage 

 in phice of barnyard-manure : its fertilizing properties are 

 mainly due to the cotton-seed, which is sparingly found 

 throughout the mass. 



Wet Kelp. 



(Sent by Mr. John F. Hobbs, North Hampton, N.H.) 



Moistm'e lost in dry air . 

 Moisture lost at 100° C. . 

 Solid residue left at 100° C. 

 Ashi weight as sulj^hates . 

 Nitrogen in wet kelp 

 Nitrogen in dry kelp at 100° C 



Per cent. 



87.04 

 88.04 

 11.96 



2.26 

 .26 



2.14 



Ash contains mainly lime, magnesia, phosphoric acid, po- 

 tassium and sodium oxide, &c. One cord is estimated in its 

 wet state to weigh one ton and a half. 



Rockweed {fresh and green) . 

 (Sent by Mr. John F. Hobbs, North Hampton, N.H.) 



Moisture lost in dry air . 

 Moisture lost at 100° C. . 

 Ash weight as sulphates . 

 Nitrogen in fresh an4 wet state 

 Nitrogen ui dry state at 100° C. 



Ash contains mainly, lune, magnesia, potassium and sodium 

 oxide, phosphoric acid, &c. . One cord is estimated to weigh 

 in its wet state two tons. 



