45 ^ ZOOLOGY. 



as time will permit. The marine forms, which the majority 

 of schools will have to study from preserved materials, and 

 the general part of the text (chapters I to VIII) should be 

 studied in the winter months when the local animals are least 

 active. In connection with the review in chapter XXV, chap- 

 ters I to VIII should be reread by the student. Such a review 

 will be especially helpful after the student has a larger body of 

 zoological details at his command. 



4. The Laboratory and its Equipment. (a) The labora- 

 tory or work room should be well lighted, and supplied with 

 flat-topped tables ; the plainer, the better. These should be 29 

 to 30 inches in height. If possible each student should have 

 a drawer where he may keep his instruments and records. 

 Sinks with running water are of course very desirable. Slop- 

 jars of earthenware should be provided for refuse dissections, 

 and the like. 



(fr) There should also be another room in which living 

 animals may be kept. Very often a part of the basement with 

 south exposure may be utilized for this purpose. The tem- 

 perature should not fall to the freezing point, nor rise unduly 

 when the furnace is heated. In such a room as this many ani- 

 mals may be kept much beyond the period when they disappear 

 outside. Fruit jars, tumblers, shallow glass or crockery 

 dishes, and, best of all, battery-jars of various sizes should be 

 accumulated here. With a little ingenuity aquarium vessels 

 of good size, with glass sides, may be made by means of good 

 quality of pine boxes, putty, and panes of glass. A square 

 may be taken from the middle of two opposite sides of such a 

 box and the window inserted in such a way as to give good 

 illumination of the interior. Running water is even more of 

 a necessity here than in the laboratory. A few bell jars, wire 

 gauze cages for insects, boxes of various kinds for other ani- 

 mals complete the list of the most essential features of a good 

 working vivarium. It is always desirable to have some green 

 water-plants in the vessels of water containing aquatic animals, 

 e. g., bladder-wort, watercress, duck weed, and spirogyra. 



