134« Mr. Denliatn Smith on the Composition of 



of the acid even when acting on 3 to 500 grs. This guano also 

 contained 1 7 per cent, of sand, &c., consisting apparently of 

 sea-sand mixed with little lumps of granite, and a very dense 

 black sand, resembling Iserine or Menachanite. 



The first lump of the " Concrete Guano," No. 5, was about 

 the size of a human skull, soft enough to be readily shred with 

 a knife, and uniform throughout, presenting the appearance 

 of a dark brown mass containing a vast number of minute 

 dirty white granulations. Its scent was very slight, and 

 neither this nor any of the other samples had an ammoniacal 

 odour, but merely the peculiar smell possessed by South 

 American guano. When shred and thoroughly mixed the 

 powder was damp, and almost as dark-coloured as Nos. 3 

 and 4< ; very different in this respect from the samples 1 and 2, 

 the analyses of which have already been detailed ; 500 grs. 

 was the quantity analysed. 



Concrete Guano. No. 5. 



13 



c »- 



<U nS 



CO 



3 ^ 



Calculated Composition. 



-Water 204-2 



Oxalate of ammonia 93*9 

 Phosphateof ammonia 61 "24 



' Phosphate of potash 77'32 

 Sulphate of soda ... 

 Chloride of sodium . 



. Organic matter 



rPhosphateofmagnes. 



J and ammonia, and 



I trace ofphosp. soda 



L Organic matter 



Oxalate of lime 109-58 



Phosphate of lime ... 62-70 

 Phosphate of magnesia 8-74 



Humus 8-62 



Sand, &c 7-20 



LWater 49-74 



Loss, &c 4-98 



1000-00 



259-44 



29-22 



6-68 



7-84 

 8-60 



m 

 e f^ 



4) « 



3 ^ 



5 <u 



3 ^ 



Constituents. 



rWater 2042 



Oxalic acid 63-78 



Phosphoric acid 79'50 



Sulphuric acid 144-14 



Ammonia 50-00 



Potash .'^8-42 



Sodium 11-09 



Soda 115-30 



Chlorine 18-13 



- Organic matter 6-68 



Magnesia 1-08 



Ammonia 0-81 



■{ Phosphoric acid 3-89 



Water and animal 



matter 



Lime 



Oxalic acid 



Magnesia 



■ Phosphoric acid 



Sand, he 



Water.. 



. Humus 



Loss 



The second sample of " Concrete Guano," No, 6, was much 

 harder than the former, and appeared to have been deposited 

 in strata; the colour was lighter than any of the preceding 

 samples and the powder drier ; yOO grs. were analysed. 



