IS93-] 27 [Harris. 
Mr. S. II. Scuddcr described the formation of tlie abdominal 
j30uch in Parnassius. (See Trans, cnt. soc. London, 18i)2, p. 
249-253.) 
Prof. W. H. Niles remarked upon cohnnnar structure in strati- 
fied rock. 
General Meeting, January 4, 181)3. 
President W. II. Niles in tbe cliair. Seventy-seven ]iersons 
present. 
Prof. W. G. Farlow gave an account of some of the botanical 
establishments of Europe. 
Dr. J. Eliot Wolff, with the aid of a series of lantern slides, 
exi)lained the apitlication of the microscope to the study of rocks. 
General Meeting, January 18, 1893. 
President \V. II. Niles in the chair. Sixty-eight peisons 
present. 
The President antiounced the death of Prof. John Oliadiah 
Westwood, an Honorary Member of the Society since November 
3, 1841. 
Prof. W. M. Davis read a report on the glacial sand-plains of 
eastern Massachusetts. 
General Meeting, Feijruary 1, 1893. 
President VV. 11. Niles in the cliair. Forty-two persons 
l)resent. 
The following paper was read : — 
A NEW INSTANCE OF STPvEAM CAPTURE. 
by hunter L. HARRIS. 
Two neighbor streams of diverse direction of flow often differ 
considerably in degree of activity, due mainly to differences in 
slope and consequent velocity. In such cases the more active 
stream often works its way backward at the head, ])ushing the 
