528 ZOOLOGY 



been found and of the best time for collection. In time the laboratory will come 

 to have an interesting set of facts, valuable not merely in assisting in the finding of 

 needed material, but as indicating local distribution (see also 522; IV, 4). The 

 students should be encouraged to make excursions, both with and without the 

 teacher, to collect material and extend the knowledge of the locality. 



If for any reason living materials cannot be secured in the locality of the 

 school, preserved specimens of marine, fresh-water, and terrestrial species may be 

 secured of dealers. The principal are: 



Supply department, Marine Biological Laboratory, Wood's Holl, Mass. (Pre- 

 served materials.) 



Henry M. Stephens, Carlisle, Penna. (Preserved and living material.) 



C. S. Brimley, Raleigh, N. C. (Preserved and living: frogs, turtles, alligators, 

 etc., in the winter.) 



The Anglers' Bait and Manufacturing Co., 333-335 W. South Water St., 

 Chicago, 111. 



Mr. A. A. Sphung, North Judson, Indiana. Frogs, turtles, clams, and crayfish 

 (living). 



Dr. F. D. Lambert, Tufts College, Mass. (South Harpswell, Maine, from 

 June 12 to September 15). (Preserved marine material.) 



Mr. George K. Cherrie, Brooklyn Institute Museum, Brooklyn, N. Y. (Pre- 

 served material.) 



Ward's Natural Science Establishment, Rochester, N. Y. 



Biological Supply Co., Rochester, N. Y. 



Most of these dealers issue price lists which may be had on application. 



In addition to such materials as indicated above, unless the instructor has the 

 time and equipment to make satisfactory permanent mounts of microscopic 

 preparations, he should secure a few, illustrative of cell structures, cell division, 

 cleavage of ova; also sections of hydra, of the earthworm, and preparations of 

 some of the more important tissues of higher animals, as bone, nerve cells and fibres, 

 epithelial tissue, glandular tissue and the like. Some of these may be purchased 

 of the dealers in microscopical supplies. They may usually be secured at reason- 

 able rates by writing to the biological departments of the large universities. 

 There are usually advanced students in these laboratories who are glad to make a 

 few dollars in connection with their work. Such preparations lend a great deal 

 of interest as demonstrations in connection with the laboratory work. 



The writer's laboratory (Millikin University, Decatur, 111.), will be able to 

 furnish to teachers a limited number of sets of the microscopic slides called for in 

 this book. 



Saint Louis Biological Laboratory, St. Louis, Mo. (Microscopic and lantern 

 slides.) 



Powers and Powers, Station A, Lincoln, Nebr. (Wonderfully fine microscopic 

 slides of certain invertebrate types.) 



6. Laboratory Records. For making these the student should have a note- 

 book of unruled drawing paper of good quality, which may be had in a tablet or 

 keptas separate sheets in an appropriate envelope; and good drawing pencils, kept 

 sharp, and of hardness suited to the paper. In the note-book the student should 

 keep, concisely and in an orderly way, the record of all his observations, experi- 

 ments, comparisons and conclusions. The notes may be kept on detached sheets 

 similar to those used for the drawings, if desired. 



