gdtmiERN PLANTER.— ADVERTISING SH^ET. 



5 



All the analyses were conducted with the rigid care of a scientific investigation. The satn* 

 pies enjoyed were also of assured integrity. The Navaza was obtained directly from the State 

 Inspector of Maryland, as an average of six cargoes imported in 1859; consequently, the eighty and 

 odd per cent hf Bone Phosphate claimed for it in circulars and advertisements are a fabulous' estimate, 

 or else were deduced from extraordinary samples. Jarvis Island Guano is represented by an average 

 of the "Henry Brigham's'" cargo, which is the best of the kind that has come under ray obser- 

 vation. The Sombrero sample was also a fair average of several cargoes, and from a reliable 

 source. 



In the Commercial and Agricultural expression for the several Guanos, as above noted, I have 

 distinguished the Phosphoric Acid, which exists in combination with Lime and Magnesia, as 

 ACTUAL Bone Phosphate, while I give the title of CALCULATED Bone Phosphate to the 

 nctual phosphate, conjointly with that portion of Phosphoric Acid present in the Guanos as Phos- 

 phate of Alumina and Phosphate of Iron, because the equivalent of the latter in Bone Phosphate 

 Lime is determined by calculation. The Alumina and Iron Phosphates, it may be proper to add, 

 though of value in the fertilization of soils, are, in degree, inferior, for that purpose, to actual 

 Bone Phosphate Lime. With this explanation, it will be evident, then, from the Table, that 

 precedence belongs to Sombrero Guano, not only because of its very much greater richness in Phos- 

 phoric Acid, but also for the reason that nearly the whole of that constituent occurs in tb 3 Guano 

 as ACTUAL Bone Phosphate of Lime. Moreover, Sombrero Guano is characterized by much 

 uniformity of dryness and composition, as well as by a very limited amount of matters which would 

 be valueless to crops. f 



2. The presence of oxide of Iron is detrimental to a fertilizer, wdien the proportion may Be 

 excessive and in indissoluble combination. But these conditions do not pertain to Sombrero 

 Guano ; for it holds only a small quantity of iron, and will yield with sufficient readiness to the 

 solvent, power of atmospheric agencies in the soil. I base my judgment upon a large, Laboratory 

 experience with this Guano. 



And I may remark, further, that the idda Of its being deficient in capacity for making Super- 

 phosphate, as pronounced by others, is founded in ignorance of the true nature of the Guano. 

 Indeed, with the proper knowledge, a Super-phosphate of the highest fertilizing efficiency can 

 be made from it at a reasonable economy of cost. ****** 



Respectfully yours, 



Octeo-3t CAMPBELL MORFlT. 



SOMBRERO CUANO. 



OCTOBER, I860. 



The proprietors of Sombrero Island fully confident that this locality is the richest known source 

 of Phosphatic Guano, have established a Laboratory on the spot, and appointed a resident chem- 

 ist, with strict instructions to select all cargoes by preliminary assays prior to their shipment from 

 the Island, so that all Guano exported from the Island shall be of the standard of 70 to 80 per 

 cent bone phosphate of lime. Cargoes of late importation have been, and those to arrive here- 

 after will be of that standard, and in order to give the consumers of Sombrero Guario the best 

 advantages of the deposit a higher grade will be fixed as soon as arrangements can be completed 

 for developing its still richer portions. It is the determination of the proprietors not only to 

 maintain the present superior character of their Gua.no, but to increase its value by sending it 

 ere long into market with a per centage bf Bone Phosphate of Lirrie, even greater than that by 

 which it now excels every other phosphatic material. 



The following analysis by Drs. Piggotand Pitt represent several cargoes of late importation: 

 1860. 



June 22nd, ......... . cai\-o Champion, by Di\ Piggot,. . 70.00 Bone Posphate of Lime. 



June 28th, . do do by Dr. Pitt, 



June 25th, do Golden Rod, by Dr. Piggot, 



June 28th, do do by Dr. Pitt 



July 25th, . do St. Mary, by Dr. Piggot, ....... 



June 28th, do do by Dr. Pitt, 



July 25th, . . do D.H.Baldwin, by Dr. Piggot, 71.61 



Aug. 22nd, do Sequine, by Dr. Pitt, 



Aug. 22nd, ...... do do by Dr. Piggot, 



Aug. 22nd,.. do Ianthe, by Dr. Pitt, 



Aug. 22nd,. do do by Dr. Piggot, 



Orders received by ROSS W. WOOD & SON, 90 Front Street, New York. 



Or, ANDREW C. ELLIOTT & CO,, 73 Smith's Wharf, Baltimore, 



EDM0ND, DAVENPORT & CO., AGENTS, Richmond, Ya. 



Oct 60— tf 



72.67 



do 



do 



do 



73.02 



do 



do 



do 



70.20 



do 



do 



do 



74.62 



do 



do 



do 



70.96 



do 



do 



do 



71.61 



do 



do 



do 



74.64 



do 



do 



do 



79.06 



do 



do 



do 



74.88 



do 



do 



do 



78.72 



do 



do 



do 



