192 THE AMERICAN MONTHLY [May 



with lig"ht as free as possible from spherical aberration, as, 

 for instance, in photog^raphy, this form would answer 

 every requirement. Mr. R. T. Lewis read a note on a 

 stridulating-org"an in a species of ant Stre/>lo<:;tiafhus trthiopicus, 

 from South Africa, accompanied bv specimens, microscop- 

 ical preparations, and some beautiful drawing's. He said 

 that althoug-h sound-producing- org^ans were known to oc- 

 cur in several kinds of ants, the present one differed ma- 

 terially in structure, and so far appeared unique. When 

 captured the insect g^ave an audible "squeak." It was a 

 formidable-looking- creature, black, and nearly one in. in 

 leng-fh, and it appeared to have a wide distribution in South 

 Africa. 



On May 2nd, 16th, and 30th there will be excursions for 

 collecting- purposes to Esher, Totteridg-e, and Epping- 

 Forest on these dates respectively. 



NEW PUBLICATIONS. 



"Keil's Medical, Pharmaceutical and Dental Direc- 

 tory." — (xcorg-e Keil, Editor, Philadelphia, announces the 

 early publication (fourth edition) of "Keil's Medical, Phar- 

 maceutical and Dental Reg-ister-Directory and Intelli- 

 g-encer," for Pennsylvania, New York, New Jersey, Mary- 

 land, Delaware and District of Columbia. Its list of Nat- 

 ional colleg-es. State hospitals, homes, dispensaries, 

 societies, and post-oftice addresses of physicians, drug-g-ists 

 and dentists, school of g-rad nation and year, all the latest 

 laws in these States, will be complete to date of issue, as a 

 personal canvass will be made for data. It is the only Di- 

 rectory published for above-named States, reg-istering- 

 g-raduates of all schools, physicians, drug-g-ists and dentists, 

 and imparting- all information needed bv the professions 

 mentioned in their daily practice. No effort will be spared 

 to make the Directory complete, and the information ac- 

 curate and reliable in the minutest detail belong-ing- to the 

 domain of medical, pharmaceutical and dental professions. 

 An experience of thirty years is sufficient g-uarantee that 

 all subjects will be properly treated in this Directory. 

 The names in larg^e cities, in addition to being- in alphabeti- 

 cal order, will be numerically arrang-ed by streets, also an 

 alphabetical list of names of the whole Directory, g-iving- 

 the pag-e of each; these features will no doubt be apprec- 

 iated. 



