MANURES AND MANURING 1 747 



show that the electrified crop, as compared with the non-electrified, showed 

 the remarkable increase of 30 per cent in grain and 58 per cent in straw. 



Electrified 

 Control . 



Total grain. Total straw. 



Increase of 

 grain. 



I 309 lb. 2 476 lb. 30 per cent. 



I 008 lb. I I 572 lb. i — 



Increase of 

 straw. 



30 per cent. 



An analysis of the s;rain and straw from the two crops was under- 

 taken at the University of Leeds. The figures obtained for the experimental 

 and control crops showed practically no difference apart from those ac- 

 counted for by experimental error. Feeding experiments are needed before 

 it can be concluded with certainty that the discharge has been without 

 effect on the food value of the oats, but is is extremely unlikely that any 

 difference would be demonstrated between the two crops. 



1261 - The Industrial Uses of Seaweed, More Especially as Manure. — gloess p., in m.\nures 



Moniteur Scientifique dii Doctcur Qiiesncrilk, Vol. VI, Part I, No. 893, pp. 97-108 ; Part II, and m.^nuring 

 Nos. 896 and 898, pp. 169-177 and 217-223. Paris, May, August and October 1916. 

 The industrial uses of seawed are classified as follows : 



I. The general use of seaweed more particularly for manure. • 



II. The use of plants other than algae, especially grass wrack {Zosfci-a spp.) as a source of : 



a) fibre 



b) paper 



c) cellulose 



d) potash manure obtained as a bye-product. 



III. The use of red algae (Rhodophyceae) for the production of gelose. 



IV. The use of the brown algae (Phaeoph3-ceae) especially the Ivaminariaceae (kelp) which 

 contain no gelose, 



a) as a source of algin for the production of : 



i) waterproofing, dressing and gum substances ; 

 11) food substances ; 



in) a natural algin product containing iodine ; 

 IV) sodium peralginate, a bleaching agent ; 

 « v) various other materials for industrial purposes. 



6) as a source of potash salts ; 



c) as a source of other salts ; 



d) as a source of iodine and bromine. 



The use of seaweed as manure. — On the coats of France (Brittany), 

 England, Scotland, Ireland and in the Channel Islands two classes of 

 seaweed are gathered : i) the kinds that grow between tide marks {Zoster a 

 spp., red algae and Fucns spp.); 2) the drift weed which is washed up from 

 below low-water mark {Laminaria spp., Zostera spp.). In the districts 

 where it is collected it forms one of the principal manures and enables 

 the land which is naturally poor to become productive. 



