This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...of this and test for starch. Add a drop of iodine to it, and if it turns to a blue color, you may know that it is starch. RELATION BETWEEN LENGTH OF STRAW AND YIELD OF GRAIN IN WHEAT Time: When Wheat Is Ripe Object: To determine whether there is any relation between length of straw and yield of grain in wheat. Material needed: Wheat field, knife, scales. DIRECTIONS When wheat is ripe, go into the field and harvest ioo stalks each of long, medium, and short straw. Cut every straw even with the ground and weigh the lots separately. Thresh the grain with the hands (will take only a short time), blow out the chaff, weigh the grain separately, and tabulate results as follows: The same investigations may be carried on with rye and barley. RELATION BETWEEN THE LENGTH OF HEADS OF WHEAT AND NUMBER OF STALKS AN ACRE TIME: WHEN WHEAT IS RIPENING Object: To determine the relation between the length of head of wheat and the number of stalks an acre. Material needed: Wheat Held, wire hoops, rule. DIRECTIONS 1. Place a wire hoop of known area over the heads of wheat, and let it slip down to the ground. The hoop must include every stalk that will stand within the hoop without being pressed in or forced. Count the number of stalks within the inclosure, and find the average length of heads within the hoop. This can be done by measuring several heads, adding the length and dividing by the number measured. 2. Repeat this in several parts of the field. Tabulate results as follows: Is there any relation between the number of stalks an acre and length of head? PREVENTING OAT SMUT TIME: FEBRUARY OR MARCH Object: To show how to prevent oat smut in the succeeding crop by treating the seeds with formaldehyde before they are sown. Material needed: Formaldehyde, oats, two plots. DIRECT... Это и многое другое вы найдете в книге Rural school agriculture; exercises for use with any text-book of agriculture, or without a text-book (Charles Wesley Davis)