Models are of great value in teaching certain biological subjects. Nearly every teacher feels the need of certain models not obtainable from dealers. With practice and a fair degree of skill, these may be made for the occasion

Guthrie, J. E.

English

Name not available

Some Home-Made Teaching Models

University of Northern Iowa

Proceedings of the Iowa Academy of Science Volume 37 Annual Issue Article 114 1930 Some Home-Made Teaching Models J. E. Guthrie Copyright ©1930 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Guthrie, J. E. (1930) "Some Home-Made Teaching Models," Proceedings of the Iowa Academy of Science, 37(1), 400-401. Available at: https://scholarworks.uni.edu/pias/vol37/iss1/114 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu. 400 IOWA ACADEMY OF SCIENCE characteristic of the leading textbooks. Each book has as author or as a co-author an experienced High School teacher. The style and grading to reading difficulties seem quite alike in the several texts. None is either a strictly type or a strictly principle book. Taxonomy and collections are dealt with lightly. Physiology, be-havior and habits of plants and animals are emphasized. Very little microscopic work and not much dissection are required. The laboratory manuals permit of many pupil and teacher demonstra-tions although provision is made for individual notebook records. The exercises contain many diagrams some of which are only to be labelled while some are to be completed before the labelling. The numerous questions require considerable observation of speci-mens and study of written material before the answers can be recorded. Relatively few original drawings are required. IowA S'I'A'rB CoLLJ~GB. AMJ<:s, low A. COMPARATIVE GROWTHS OF INFUSORIA-FREE AND NORMAL LAMBS E. R. BBCKBR AND R. E. EvBRETT The digestive tracts. of all ruminants are normally inhabited by Protozoa. It has been held by some that these are harmful ; by others that they may be helpful in the digestion of cellulose and protein. Experiments in defaunating lambs by the use of copper sulphate indicated that the infusoria are not of importance, nor necessary for normal digestion in lambs. SOME HOME-MADE TEACHING MODELS J. E. Gunrn1E Models are of great value in teaching certain biological subjects. Nearly every teacher feels the need of certain models not ob-tainable from dealers. \Vith practice and a fair degree of skill, these may be made for the occasion. 1Guthrie: Some Home-Made Teaching ModelsPublished by UNI ScholarWorks, 1930ABSTRACTS 401 1L\.TERIALS DEMONSTRATED 1. Plaster of paris, easily molded, fairly easily carved, rather brittle and heavy. 2. "Macalite," a commercial building block used for inside partitions, com-posed of plaster of paris and wood dust. It is easily carved, finishes fairly well and holds paint. Its wood content makes it much lighter than the preceding, though almost as brittle. 3. Modeling clay. Easily and quickly handled, suitable for demonstrations before classes. Makes a fairly permanent model in thick masses, becomes too brittle for delicate parts, loses oil, discoloring any absorbent matter in contact with it. 4. Balsa wood. The lightest wood known. Easily carved and finished. Has little tensile strength but lasts well when painted. It is so light that large models are relatively light and not top-heavy. 2Proceedings of the Iowa Academy of Science, Vol. 37 [1930], No. 1, Art. 114https://scholarworks.uni.edu/pias/vol37/iss1/114

https://scholarworks.uni.edu/cgi/viewcontent.cgi?article=5263&context=pias

Some Home-Made Teaching Models

Abstract

Similar works

Full text

Available Versions

Name not available

University of Northern Iowa