Volume VII. No. 174 June 4, 1886 



SCIENCE 



Comment and Criticism. — Learning languages. — The death of Ranke. — The two disappointing comets. 493 



Health of New York during April . . . . . . . . . 493 



Sympathetic vibrations of jets . . . . . . . . . 494 



Boston Letter. — Longevity in Salem. — The two hundred and fiftieth anniversary of Harvard. — Generous 

 gifts to the Harvard observatory. — The annual meeting of the American academy of arts and sciences. 

 — The grave of Pourtales. — The topographical survey of Massachusetts ...... 503 



Notes and News. — The re-organization of the. Japanese university. — Death of Dr. Charles Upham 



Shepard. — The investigation of yellow-fever ........ ... 504 



Letters to the Bditor. 



A national zoological garden. — R. W. Shufeldt 505 1 Muscles of the hind-limb of Cheiromeles torquatus. 

 Scent-organs in some bombycid moths. — John B. — Harrison Allen ..... 506 



Smith . . . . . . . 505 Double vision. - Joseph. LeConte .... 506 



SCIENCE SUPPLEMENT. 



An Indian snake-dance . . . Kosmos Mendelieff 507 



The article 'Psychology' in the 'Encyclopaedia Britannica ' . . . . .514 



The Science Company, Publishei's % New York, 



47 Lafayette Place. 



Price 15 cents. 



