286 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
means of excursions to the seashore on Wednesday and Saturday 
afternoons in suitable weather. The beaches of Revere, Swamp- 
scott, Marblehead, the cliffs and tide pools of Nahant, Marblehead 
Neck, and Nantasket, and the mud Bats and bridge jhles of Beverly 
were visited and explored. One excursion was made to the outer 
shores of Cape Cod, taking in Buzzard’s Bay on the return. A 
party of fourteen of the most enthusiastic of these pupils left 
Boston under Mr. Grabau’s direction on Friday and did not return 
until the following Monday. Our thanks are due to the authorities 
of the Marine Biological Laboratory for courtesies shown this party 
and for the use of their steam launch. 
This course originated at first in the work done by Mr. Grabau 
as lecturer and guide in the Museum, but was transferred to the 
Teachers’ School of Science, because it was necessary to charge a 
small fee to cover the expenses. 
Mr. Grabau also gave a course of ten lessons on Saturday morn¬ 
ings at nine o’clock in the laboratory of the Society. The class was 
as large as could be conveniently handled and accommodated. The 
members were instructed in the use of the microscope and in the 
technique of killing, staining, and mounting specimens of hydroids, 
and also in the structure of our common species. 
After the regular course was finished, a ten days’ excursion was 
made to Bayville on Limekilns Bay, coast of Maine. A laboratory 
was established, furnished with microscopes and accessories, and a 
small collection of text books and works on general natural history 
were placed in an adjoining room that served as a library. Four 
boats and collecting apparatus completed this equipment. Fourteen 
persons, mostly teachers of Boston schools, were members of this 
class. Collections were made and laboratory work done upon the 
animals gathered each day, special attention being given to hydroids 
in order to connect the work with that previously done in Boston. 
A little geology was mingled with this course in continuation of 
Mr. Grabau’s previous lectures in this direction, and an island in the 
bay was mapped in detail. A small fee was charged each member 
of this class. 
During July and August a course of twelve laboratory exercises 
of two hours each on invertebrate zoology was given by Mr. Grabau 
on Monday, Wednesday, and Friday afternoons. These were 
attended by six teachers and a small tuition fee paid. 
During September, October, and November, a course of twelve 
