538 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 fiindng 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. 



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

 served materials.) 



The Anglers' Co., 913 W. Randolph St., Chicago, 111. (Slides and laboratory 

 materials.) 



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

 (living). 



Ward's Natural Science Establishment, Rochester, N. Y. (Slides and demon- 

 stration preparations.) 



Southern Biological Supply Co., Natural History Building, New Orleans, La. 

 (Alligators, giant bull-frogs, and southern specialties.) 



Powers and Powers, Station A, Lincoln, Nebr. (Living amoeba, fresh-water 

 hydra; slides.) 



General Biological Supply House, 1177 E. 55th St., Chicago, 111. (Western 

 Representatives of Woods Hole Biological Laboratory.) 



Michigan Biological Supply Co., Nickels Arcade, Ann Arbor, Mich. (Slides; 

 cultures of protozoa.) 



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

 slides.) 



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



Unless the instructor has the time and equipment to make satisfactory per- 

 manent mounts of microscopic preparations, he should secure a few, illustrative of 

 cell structures, cell division, cleavage of ova; also sections of hydra, of the earth- 

 worm, 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 piu-chased of the dealers in microscopical supplies. They may 

 usually be secured at reasonable rates by writing to the biological departments of 

 the large universities. Such preparations lend a great deal of interest as demon- 

 strations in connection with the laboratory work. 



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 

 kept as 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. 



Outline drawings and diagrams must be made of every structure or relation 

 which can be shown by a well-labeled sketch. Shading should be sparingly used 

 and only with a matured purpose, the result first being tested on a separate 

 sheet of paper. The name of each portion of the sketch should be determined and 

 named by running a leader from the part to an appropriate place for the name. 

 The drawings are always to be made in the laboratory and from the specimen studied. 



