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 Streblognathus cethiopicuSy 

 from South Africa, accompanied by 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 

 length, and it appeared to have a wide distribution in South 

 Africa. 



On May 2nd, IGth, 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." — Georg-e Keil, Editor, Philadelphia, announces the 

 early publication (fourth edition) of "KeiPs 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-ofl&ce 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- 

 graduates of all schools, physicians, drugg"ists and dentists, 

 and imparting all information needed by 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. 



