Cornell Science Leaflet Volume 1-3 (Paperback)

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: ...for two minutes. As soon as the mixture becomes thickened like jelly, the small pail should be placed inside the larger wooden one and the space between them packed with small pieces of ice. Salt is sprinkled on the ice and the small pail is turned backwards and forwards to hasten the freezing. As soon as frozen, the cream is ready to serve. Precautions.--Do not allow the milk to become too firmly coagulated after adding the rennet. As soon as it becomes jelly-like start the freezing. If a small ice-cream freezer is available, it can be used to advantage, but the two pails answer the purpose. Both before and after being used, all utensils should be thoroughly washed and cleansed. Note.--This lesson might be made most interesting for the boys and girls to work out together. It would give the teacher opportunity to help the pupils to realize the importance of cleanliness in the preparation of food. FORESTRY WHY TREES GROW TALL Herbert A. Smith Object.--To consider why trees grow tall. Material.--A live tree to look at, a piece of charcoal, a handful of dead leaves, and two or three green leaves of any plant. The most striking difference between trees and other kinds of plants is that trees grow their leaves on a crown which is lifted high in the air. Is this advantageous to them? And how did they gain the power to do it? To answer the first question we need to know what leaves are for. About half the substance of dry wood, by weight, is obtained from water, which is taken through the roots. Most of the other half is obtained from air, and is taken in through the leaves. That anything so solid as wood should be made largely of air seems a very strange thing, but it is true. A piece of charcoal is merely that part of the wood which was taken from the air by the...