176 ANIMAL RESOURCES AND FISHERIES OF UNITED STATES. 



VII. MANUFACTURE OF FERTILIZERS. 



45. PREPARATION OF GUANO. 



model of fih-gttaano works. 



Grinders and pulverizers. 

 Mixers. 



25822. Model of guano-mixer. Patented April 27, 1867. Poole and Hunt, 



Baltimore, Md. 



This mixer is employed in the fish -guano works for the purpose of 

 thoroughly mixing the fish-scrap with the mineral phosphates and sul- 

 phuric acid. 



Guano in its various stages, with its ingredients, South Carolina phos- 

 phates, Navassa phosphates, scrap (crude and dried), sulphuric acid, 

 kainite, screened and unscreened guano, and sea-weed used in prepara- 

 tion : a full series of these is exhibited in the case of Guanos. 



VIII. LIMES. 



46. BURNING OF LIME. 

 Models of kilns for bprning- shells. 



IX. PRESERVATION OF THE ANIMAL FOR SCIENTIFIC 



USES. 



47. APPARATUS FOR MAKING AND PRESERVING ALCOHOLIC SPECI- 

 MENS. 



Tanks and jars. 



Agassiz collecting-tank. 



Army collecting-tank. 



Museum storage- tai.k, Agassiz model. 



Anatomical jars. 



Self-sealing jars used in collecting. 



Vials. 



Syringes for injecting. 

 Inflatable bags. 

 Preservative mixtures. 



Alcohol. 

 Glycerine. 



