338 BOARD OF AGRICULTURE. 



when the pods were well filled with a gelatinous matter ; and 

 the other one in the month of December, when this sub- 

 stance is not present. The samples arrived by express, well 

 packed, in a fresh state. 



I. 



Rockweed collected in May, 1879. 



Per cent. 



Fresh wet rockweed lost, in the air, of water . 78.700 



Fresh wet rockweed lost, at 100° C, of water . 90.400 



Air-dried rockweed consisted, of vegetable matter 88.220 



Air-dried rockweed consisted, of water . . il.7S0 

 The filled pods left, at 100° C, of solid organic 



matter 7.360 



The fresh stems left, at 100° C, of solid organic 



matter ........ 30.650 



The slime of the pods dried at 100° C. contained, 



of nitrogen 2.920 



Rockweed (entire plant with filled pods) dried at 



100° C. contained, of nitrogen .... 2.286 

 Rockweed air-dried contained, of nitrogen . . 2.017 

 Rockweed, fresh (wet), contained, of nitrogen . .487 

 Rockweed dried at 100° C. contained, of ashes . 28.930 

 Rockweed, air-dried, contained, of ashes . . 6.220 

 Rockweed, fresh (wet), contained, of ashes . 3.770 

 The slime of the pods of the rockweed con- 

 tained, of ashes 49.356 



One hundred parts of the ash contained : — 



Per cent. 



Potassium oxide 4.842 



Sodium oxide 12.050 



Calcium oxide 2.691 



Magnesium oxide . . • . . . 2.753 



Ferric oxide .338 



Sulphuric acid 7.986 



Phosphoric acid 6.240 



The quantities of some of the principal constituents of 

 the ash are largely due to the sea-water, and the little shells 

 which adhered to the plant when calcined. 



H. 



Rockweed collected in December, 1879. 



Per cent. 



Fresh wet rockweed lost, in the air, of water . • 65.92 

 Fresh wet rockweed lost, at ]00° C, of water . 76.92 



