THE AMERICAN 



'y 3 C 3 MONTHLY 



MICROSCOPICAL JOURNAL. 



VOL. XIX. APRIL, 1898. NO. 4. 



Contents. 



The Eye of Pecten, (a Scallop) 49 



Microscopic Billing-sgate 60 



Practical Suggestions, — Hard Objects, Scientific Names, Rliizo- 



selinia, Cetraria 62 



KdiToriaL- — General Index, Apparatus, Insurance, Opaque Ob- 

 jects, Angina, Mosquitoes, Agar-Agar 64 



Recent Publications.— Bacteria 66 



Science Gossip.— Faint Rays, Yellow Fever, Insoluble Glue, 



Snake Poison 66 



Miscellaneous. — For Sale, Exchange, etc 67 



The Eye of Pecten Irradians or the Scallop. 



By F. a. Rogers, M. D. 

 A general study of the great and important sub-king- 

 dom of the animal creation, the Mollusk, reveals many 

 new and strange things to the lover of nature, while 

 some of the minute rudimentary forms of the special 

 organs of sight, hearing, taste and touch which MoUusks 

 possess make ve^-y interesting objects for microscopic ex- 

 amination. As we look at the clam, oyster, scallop, snail 

 and the multitude of forms belonging to the Mollusca the 

 inquiring mind often wonders how much of what is 

 going on around them do they perceive and by what 

 <means if any is light, sound or taste, any or all of these 

 communicated to these organisms. In some forms the 

 special organs of sense are more highly developed than 



