21 
Lake; a fourth in Thompson’s Lake ; and a fifth in Flag Lake, 
between Thompson’s Lake and the river. To these were added 
in 1896 a substation at Phelps Lake—from which, indeed, a 
single quantitative collection had been made in 1894—and 
one in Spoon Liver a short distance above its mouth. From 
these various substations a thousand quantitative collections 
have been made since the Station opened; those from April, 
1894, to June 80, 1895, by Professor Frank Smith or under 
his immediate direction, and those subsequent to that time by 
Dr. C. A. Kofoid. All these tows have of course been carefully 
preserved by methods such as to permit their quantitative com¬ 
parison, and about three fourths of them have been quantitatively 
determined by Dr. Kofoid by methods of precise measurement. 
A considerable beginning has also been made in the enumera¬ 
tion of their contents by counting under the microscope. 
Various modifications of plankton methods, elaborate tests 
of the apparatus used and of the methods of discussion current, 
and other items of improvement in the equipment and in the 
methods of planktology will he reported by Dr. Kofoid in a 
paper on this department of our work now nearly ready for 
the press. For certain general conclusions of considerable 
interest and of at least provisional value reference may be made 
to the same paper. 
COLLECTIONS ACCUMULATED. 
The total number of lots of specimens collected since the 
opening of the Station amounts to 6,628, besides 5,500 pinned 
insects. Of the former, 484 lots contain materials for a study 
of the food of animals, 300 of them being the contents of the 
stomachs of fishes; 270 are collections of vertebrates; 3,560 
are preserved collections of invertebrate animals; 1,823 are 
towing-net collections; and 543 were collections of Eotifera 
and Protozoa, most of which were studied alive because incapa¬ 
ble of satisfactory preservation. The entire number of collec¬ 
tions, including under this head each object or lot of objects 
specially numbered and separately entered on our notes or in 
the accessions’ catalogue of the Station, is thus nearly 10,000. 
Besides these, mention should he made of about 400 micro¬ 
scopical slides of serial sections of oligocliaete worms made for 
Professor Smith in the course of his studies of that group. 
