1890.] 
17 
[Annual Meeting. 
slope and volume, have made but little progress in clearing out 
their drift-encumbered valleys ; but along the shore the sea has 
worked with its usual energy, cutting away the drift formations 
within its reach and forming extensive beach, bar and marsh de- 
posits. The superficial oxidation of the drift deposits, the chemical 
decay so marked in some of the dikes, and the organic deposits — 
peat andtripolite, as well as the bog iron-ore, now forming in many 
swamps and marshes are other phenomena which must be referred 
to the present or post glacial epoch in the history of the Boston 
Basin. 
The following statistics refer to these four courses : 
Teachers’ School of Science. 
1889-1890. 
Number of tickets distributed. 
To teachers. 
To other 
Zoology, 
49 
38 
11 
Field Geol. 
94 
74 
20 
Physical Hist, of ) 
Boston Basin ) 
555 
327 
217 
698. 
439 
248 
COURSE ON PHYSICAL HISTORY OF THE BOSTON BASIN. 
GRADE 
Boston Public Schools. 
Tickets distributed to 
Principals, 3 
Masters and Sub-masters, 14 
Assistants, 171 
OF TEACHERS. 
Out-of-town Schools. 
Tickets distributed to 
Principals, 22 
Masters and Sub-masters, 5 
Assistants, 112 
Total, 
188 
Total, 
139 
LIST BY TOWNS. 
Boston 
188 
Everett 
18 
Needham 
1 
Brockton 
7 
Hyde Park 
2 
Quincy 
7 
Brookline 
4 
Marblehead 
2 
Somerville 
28 
Cambridge 
63 
Melrose 
4 
Wellesley 
3 
Total, 
327 
Complimentary 
145 
Miscellaneous, 
72 
Private Schools, 
11 
555 
VOL. XXV 2 NOVEMBER, 1890. 
PROCEEDINGS B. S. N. H. 
