XI. INSTRUCTION. 821 



XL DIAGRAMS, MODELS, PREPARATIONS, AND 

 OTHER APPLIANCES FOR INSTRUCTION IN 

 BIOLOGY. 



3807. Photographs of Microscopic Objects on Glass. 



(Dr. Maddox\ J. H. How and Co. 



3808. Recent Marine Mollusca. Typical collection, com- 

 prising 300 genera; to illustrate Woodward's " Manual of the 

 Mollusca," and other works. R. Damon. 



3809. Land and Fresh Water Mollusca. Typical collec- 

 tion, comprising 155 genera; to illustrate Woodward's "Manual 

 of the Mollusca," and other works. R. Damon. 



3810. British Marine Shells, illustrative of Dr. J. Gwyn 

 Jeffreys's " British Conchology." 336 species. R. Damon. 



3811. British Land and Fresh Water Shells, illustrative 

 of Dr. J. Gwyn Jeffreys 's " British Conchology." 122 species. 



R. Damon. 



3812. Skeletons. Two specimens of Manis or Pangolin, 

 exhibiting a method of articulating skeletons, by which all the 

 surfaces of the bones can be examined. Invented by Mr. James 

 Flower, articulator to the Royal College of Surgeons. 



Royal College of Surgeons of England. 



In the larger specimen the parts of the skeleton are in their natural rela- 

 tion, but any portion which may be required for examination can be removed 

 without disturbing the rest, as is shown in the smaller specimen, which is 

 divided into various segments, the individual bones of which are united by 

 flexible wires. 



3813. Carbon Photographs of microscopic objects for pro- 

 jection by the lantern. 



Professor D. Huizinga, Physiological Laboratory of the 

 University of Groningen. 



3815. Case containing twelve Injected Preparations by 



the celebrated Lieberkiihn (born 1711, died 1756) ; each prepara- 

 tion is separately mounted in a brass magnifier with an ebony 

 handle. The Royal College of Surgeons of England. 



The object, which is opaque, is viewed with light concentrated upon it by 

 means of a concave polished metal condenser (known as a "Lieberkiihn "), 

 and magnified by a simple lens adapted to a perforation in the centre of the 

 condenser. 



3816. Two small Cases with Iiieberkiihn s Preparations 



in microscopes. 



Royal Museum at Cassel (Director^ Dr. Pinder). 



