APPENDIX 283 



rate of settling of mixtures prepared by the use of dilute 

 solutions (as recommended) alongside of mixtures made 

 from concentrated solutions. 



Propagation by seeds (344). — Instruct the students 

 in the use of the hand seed-drill and broadcast sower. 

 Let them ascertain how much clover seed the broadcast 

 machine is sowing to an acre, by laying on the ground or 

 floor several sheets of paper, exactly one foot square, 

 painted with glycerine to catch the falling seeds. Hav- 

 ing learned the average number of seeds deposited per 

 square foot with a given rate of motion of the machine, 

 let the students compute the number of seeds sown per 

 acre, and reduce this to ounces. The number of clover 

 seeds in an ounce may be ascertained by dividing an 

 ounce of seed among the students for counting. 



Propagation by layers (349). — Instruct the students 

 in layering canes of the grape, and in mound-layering 

 the stems of the gooseberry. 



The bulb (352). — Dissect bulbs of the onion, tulip, 

 lily, and the like, ascertaining their structure and finding 

 the embryo flowers. 



The coldframe (364) . — Require the students to make 

 a drawing and write a description of a coldframe, from 

 a model furnished them. 



The hotbed (365) . — Let the students assist in making 

 a hotbed after the plan described. Also let them note 

 the temperature of the soil within the frame on several 

 successive days after the bed is finished, and give them 

 instruction in ventilating the hotbed. 



The propagating bed (368). — Require the students to 

 make a propagating bed in the greenhouse, after the 

 plan described. 



Stem cuttings (373-375). — Let the students make 



