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61.
My best teacher     
Answer Me That! Suzanne E. Dennis. Illustrated by Owen Wood. New York: The Bobbs‐Merrill Company, 1969. 29 pp. $4.50.

Educational and Psychological Measurement. David A. Payne and Robert F. McMorris. Waltham, Mass: Blais‐dell Publishing Company, 1967. X + 419 pp. $4.95.

The Exceptional Infant. Jerome Hellmuth, ed. Seattle, Washington: Special Child Publications, 1967. 568 pp. $12.50.

The Green Thumb Story. Jean Fiedler. Pictures by Wayne Blickenstaff. New York: Scholastic Book Services, 1964. 48 pp. 350.

School Is . . . by the people in Room 122, P. S. 52, Buffalo, New York and their teacher Theresa Lopata. Designed and illustrated by Tim Lewis. New York: The Macmillan Company, 1969. 61 pp. $1.95.

The Principal Works with the Visually Impaired. Geraldine T. Scholl. Washington, D. C.: The Council for Exceptional Children, 1968. 62 pp. $1.50.

The Human Reproductive System. Morris Krieger. New York: Sterling Publishing Co., Inc., 1969. 96pp. $4.94.

Elementary School Science and How to Teach It. Glenn O. Blough and Julius Schwartz. New York: Holt, Rinehart and Winston, Inc., 1969. 810 pp. $11.95.

The Changing Classroom: The Role of the Biological Sciences Curriculum Study. Arnold B. Grobman. Garden City: Doubleday &; Company, Inc., 1969. 370 pp. $6.95.  相似文献   
62.
Of only 72 persons aged 62 and older who are enrolled for credit on campuses of the University of Wisconsin system, 48 responded to a questionnaire designed to assess demographic characteristics, attitudes toward lifelong education, and class format and group make‐up preferences. Respondents were more likely to be employed (60.4%), home owning (79.2%), and younger (M = 67.1, SD = 8.19; than both auditing and nonparticipant elders previously described (Hooper & March, 1978). Female credit earners reported preferring seminar format, while male credit earners preferred lecture format; these preferences are opposite to those expressed by auditing respondents in the earlier study. Only 16.3% of the credit earners had fewer than 12 years of education, and only 4.8% had no previous experience of the university through their own participation or that of members of their families. Implications of the findings for teachers of older students are discussed.  相似文献   
63.
64.
The experiments of several previous investigators were repeated in substance with apparatus designed to make it possible to distinguish between ionization and certain spurious factors which have made questionable much of the existing evidence relating to ionization by positive-ion impact. A great many current-potential measurements and curves were obtained at different gas pressures and with a variety of electrical arrangements. The data and curves thus obtained present direct evidence (a) that the previously so-called “ionization current” is due to a secondary electron emission from the platinum walls of the ionization chamber, (b) that this secondary electron emission is produced by the impact of the positive ions with these metal walls, (c) that either there is no ionization in hydrogen gas by the impact of the positive ions accelerated by potential differences up to 925 volts, or that if this phenomenon exists, as is indicated by visual and spectroscopic evidence, its effects are so small at relatively low pressures (.012 mm.) that it is completely masked by secondary phenomena which make its detection by the ordinary direct methods problematic, and (d) that it seems possible that at relatively high gas pressures (considerably above .012 mm.), ionization by positive ions might be an important factor with accelerating potential differences between the ends of their M.F.P. well within this same range of voltages.  相似文献   
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